Alaska contains 665,384 square miles of land, making it the largest state in the United States by area—more than twice the combined size of Texas, California, and Montana. The state's 6,640 miles of coastline touch three seas: the Pacific Ocean, Bering Sea, and Arctic Ocean. This scale creates environmental conditions that exist nowhere else within U.S. borders. Eight national parks protect 54 million acres of wilderness, with Wrangell-St. Elias National Park and Preserve alone covering 13.2 million acres—an area larger than Switzerland. Seventeen of the twenty highest peaks in the United States rise from Alaska's ranges, with Denali reaching 20,310 feet above sea level, the highest point in North America. The Brooks Range stretches 700 miles across the northern third of the state, forming a continuous alpine barrier that has never been crossed by a road. Glacier Bay National Park holds 1,045 glaciers, more than any other protected area in the world's temperate zones. The Tongass National Forest in Southeast Alaska covers 16.7 million acres, making it the largest intact temperate rainforest on Earth, with western red cedar, Sitka spruce, and western hemlock forming canopies that absorb more carbon per acre than tropical rainforests.
The state's position between 54 and 71 degrees north latitude creates light conditions unknown elsewhere in the United States. Barrow, now officially called Utqiaġvik, experiences continuous daylight from May 10 to August 2 each year—84 consecutive days without sunset. The same location sees no sunrise from November 18 to January 24, a 67-day period of civil twilight at midday. Fairbanks receives 21 hours and 49 minutes of daylight on the summer solstice and 3 hours and 42 minutes on the winter solstice. These extremes shape wildlife behavior, human settlement patterns, and agricultural possibilities in ways that cannot be replicated at lower latitudes. The aurora borealis appears an average of 243 nights per year in Fairbanks, with peak activity occurring between 10 PM and 2 AM during September through March. Geomagnetic activity during solar maximum years creates auroral displays visible as far south as Ketchikan. The phenomenon results from solar wind particles colliding with gases in Earth's atmosphere at altitudes between 60 and 200 miles, producing green, red, blue, and purple light emissions that move at speeds exceeding 4,000 miles per hour.
Alaska's wildlife populations exist at densities and diversities that define the state's ecological value. The state holds an estimated 30,000 brown bears, representing approximately 98 percent of the grizzly bear population in the United States. Kodiak Island supports a distinct subspecies, Ursus arctos middendorffi, with adult males weighing between 900 and 1,400 pounds—among the largest terrestrial carnivores on Earth. Polar bears number approximately 4,000 along Alaska's northern and western coasts, with the Southern Beaufort Sea subpopulation showing documented declines due to reduced sea ice extent. Katmai National Park's Brooks Falls hosts the planet's densest concentration of brown bears during July and September, when sockeye salmon runs bring 60 to 100 individual bears to a single half-mile stretch of river. The state's moose population exceeds 200,000 animals, with the largest bulls carrying antlers spanning more than 6 feet and weighing up to 40 pounds. Alaska contains 32 caribou herds totaling approximately 750,000 animals, with the Western Arctic Herd historically reaching 490,000 individuals during population peaks in 2003. These herds migrate up to 3,000 miles annually, the longest terrestrial migration of any mammal on Earth.
Marine ecosystems surrounding Alaska generate biological productivity that supports commercial fisheries, subsistence harvesting, and wildlife populations across the North Pacific. Bristol Bay produces the world's largest remaining wild sockeye salmon runs, with returns averaging 37.5 million fish annually between 2000 and 2020. The 2021 run reached 65.5 million sockeye, the largest return in recorded history. Five salmon species—king, sockeye, coho, pink, and chum—spawn in more than 12,000 rivers, streams, and tributaries throughout the state, with total annual returns exceeding 200 million fish during strong cycles. Bering Sea and Aleutian Islands waters support 60 percent of U.S. commercial fishery landings by volume, with pollock, Pacific cod, halibut, and crab generating 5.6 billion dollars in dockside value in 2019. King crab harvested from the Bering Sea can measure 6 feet from leg tip to leg tip, with individual legs weighing more than 1 pound. Humpback whale populations in Southeast Alaska waters increased from approximately 300 individuals in 1980 to more than 2,000 by 2015, following protection under the Marine Mammal Protection Act and Endangered Species Act. Prince William Sound holds one of the highest densities of sea otters in the world, with populations exceeding 18,000 animals in a 9,000-square-mile area.
The state's bird populations include species found nowhere else in North America. The Aleutian Islands and Bering Sea coasts host 40 million seabirds representing 30 species, including crested auklets, parakeet auklets, least auklets, horned puffins, tufted puffins, red-faced cormorants, and red-legged kittiwakes. Alaska contains more than 50 percent of the world's nesting population of horned puffins and 80 percent of red-legged kittiwakes. The Copper River Delta near Cordova hosts the entire breeding population of dusky Canada geese, approximately 15,000 birds that winter exclusively along the Oregon and Washington coasts. Bald eagles nest in Southeast Alaska at the highest densities recorded anywhere on Earth, with surveys documenting 483 nests in a single 100-square-mile area near Juneau. The Chilkat River near Haines attracts 3,000 to 4,000 bald eagles each November, the largest gathering of the species in the world, drawn by a late chum salmon run that persists due to geothermal warming of river gravels. Ptarmigan, the state bird, exists in three species—willow, rock, and white-tailed—with populations cycling between 300,000 and 2 million birds depending on predation pressure and winter severity.
Alaska's Indigenous cultures represent continuous occupation spanning at least 14,000 years, with distinct languages, subsistence practices, and artistic traditions developed across five cultural regions. The Iñupiat people inhabit northern and northwestern Alaska from the Brooks Range to the Bering Strait, traditionally relying on bowhead whale, walrus, seal, caribou, and fish. Bowhead whale hunts near Utqiaġvik follow methods documented for more than 2,000 years, with spring harvests conducted from skin boats called umiaq and crew sizes of 8 to 10 hunters. The Yup'ik and Cup'ik peoples occupy southwestern Alaska from the Yukon-Kuskokwim Delta to Bristol Bay, with subsistence patterns centered on five salmon species, herring, smelt, waterfowl, and marine mammals. Yup'ik mask-making traditions produce ceremonial pieces featuring movable parts, intricate feather arrangements, and painted designs representing animal spirits and transformation narratives. The Unangan people of the Aleutian Islands developed maritime technologies including the iqyax, a kayak design with bifid bows that reduced wave impact during ocean hunting. Unangan basket weavers use beach rye grass harvested in July to create pieces with more than 2,500 stitches per square inch, some of the finest basketry produced anywhere on Earth. Tlingit, Haida, and Tsimshian peoples of Southeast Alaska created the totem pole tradition, with surviving poles in Sitka, Ketchikan, and Wrangell dating to the 1880s. The Tlingit Kiks.ádi clan's potlatch ceremony in 2004 distributed goods valued at more than 100,000 dollars to attending clans, continuing a reciprocal exchange system documented in Russian colonial records from 1805.
Twenty Native languages from four distinct language families remain spoken in Alaska, though all are classified as endangered by UNESCO. Iñupiaq, part of the Eskimo-Aleut family, has approximately 2,000 speakers across the North Slope, Northwest Arctic, and Bering Strait regions, with teaching programs in Utqiaġvik, Kotzebue, and Nome attempting to increase fluency among children. Central Alaskan Yup'ik retains approximately 10,000 speakers, the largest speech community of any Native American language in the United States. The Alaska Native Language Center at the University of Alaska Fairbanks has documented 20 Alaska Native languages, producing dictionaries, grammars, and teaching materials for 14 of them. Tlingit has fewer than 200 fluent first-language speakers as of 2020, down from an estimated 10,000 in 1900, with the youngest fluent speakers born in the 1960s. Language revitalization programs in Juneau, Sitka, and Hoonah have enrolled more than 400 students in immersion classes since 2012. Gwich'in, spoken in 15 communities across Alaska and Canada, retains approximately 300 speakers in Alaska, with the Gwich'in language program in Fort Yukon teaching children through third grade entirely in the ancestral language. Haida, spoken by fewer than 30 people in Alaska as of 2020, faces extinction within one generation without successful transmission to children, though recording projects have archived more than 500 hours of elder speech.
The Alaska Purchase of 1867 transferred 586,412 square miles from Russia to the United States for 7.2 million dollars, equivalent to approximately 133 million dollars in 2020 currency or 2 cents per acre. Secretary of State William Seward negotiated the treaty signed on March 30, 1867, with transfer occurring on October 18, 1867, now celebrated as Alaska Day. Initial public reaction labeled the purchase "Seward's Folly" and "Seward's Icebox," with the House of Representatives debating refusal of appropriations for 18 months before approving payment. The discovery of gold near Juneau in 1880 by Joe Juneau and Richard Harris, guided by Tlingit prospectors Kowee and Sitka Jack, established the first large-scale mining operation in Alaska. The Klondike Gold Rush beginning in 1896 brought 100,000 prospectors to the region, with approximately 40,000 reaching Dawson City in Canada's Yukon Territory. The Nome Gold Rush of 1899 drew 20,000 people to the Seward Peninsula, where gold deposits extended onto the beach face, allowing prospectors to pan directly from ocean sand. Gold production from Alaska between 1880 and 1944 totaled approximately 26 million troy ounces, worth 910 million dollars at historical prices and more than 40 billion dollars at 2020 gold values.
Alaska achieved territorial status in 1912 and statehood on January 3, 1959, becoming the 49th state after a territorial referendum approved the measure by a margin of 5 to 1. The Alaska Statehood Act granted the new state the right to select 104 million acres of federal land, creating conflicts with Indigenous land claims that persisted until passage of the Alaska Native Claims Settlement Act in 1971. That act conveyed 44 million acres and 962.5 million dollars to Alaska Natives through 12 regional corporations and more than 200 village corporations, the largest land settlement in U.S. history. The Trans-Alaska Pipeline System, completed in 1977, stretches 800 miles from Prudhoe Bay to Valdez, crossing three mountain ranges and more than 800 rivers and streams. The pipeline cost 8 billion dollars to construct, employed 70,000 workers at peak construction, and has transported more than 18 billion barrels of oil since initial operation. Daily throughput peaked at 2.1 million barrels in 1988 and averaged 480,000 barrels per day in 2020. Oil revenues provided 89 percent of Alaska's unrestricted state revenue in 1981, declining to approximately 70 percent by 2019. The Alaska Permanent Fund, established in 1976, holds oil revenue invested in stocks, bonds, and real estate, with assets exceeding 77 billion dollars in 2020. Annual dividend payments to eligible residents began in 1982, with payouts ranging from 331 dollars in 1984 to 2,072 dollars in 2015, averaging approximately 1,100 dollars per person across all years.
The Good Friday Earthquake of March 27, 1964, registered magnitude 9.2, the second-largest earthquake ever recorded worldwide and the most powerful in North American history. Ground displacement reached 50 feet horizontally and 38 feet vertically in some locations. The earthquake generated tsunamis reaching heights of 220 feet in Shoup Bay and 101 feet in Valdez Inlet. Anchorage experienced ground acceleration exceeding 0.18g for more than 3 minutes, causing soil liquefaction across the Turnagain Heights neighborhood, where 75 homes slid into Cook Inlet. The earthquake killed 131 people, with 119 deaths caused by tsunamis. Property damage totaled 311 million dollars in 1964 currency, equivalent to 2.3 billion dollars in 2020. Vertical land displacement permanently raised some coastal areas by 38 feet and lowered others by 8 feet, altering tidal patterns and marine ecosystems across 70,000 square miles. Seismic monitoring networks established after 1964 now track more than 40,000 earthquakes annually in Alaska, with the state experiencing more seismic events than the rest of the United States combined.
The Exxon Valdez oil spill of March 24, 1989, released 10.8 million gallons of crude oil into Prince William Sound when the tanker struck Bligh Reef. The spill contaminated 1,300 miles of coastline, killed an estimated 250,000 seabirds, 2,800 sea otters, 300 harbor seals, 250 bald eagles, and 22 orcas. Initial cleanup efforts employed 10,000 workers, 1,000 boats, and 100 aircraft at a cost exceeding 2.5 billion dollars. Exxon paid 900 million dollars in criminal and civil settlements and an additional 507 million dollars in fines. Long-term ecological damage assessments documented persistent oil in beach sediments more than 25 years after the spill, with some sea otter and Pacific herring populations remaining below pre-spill levels into 2014. The disaster prompted passage of the Oil Pollution Act of 1990, requiring double hulls on all tankers in U.S. waters by 2015 and establishing liability limits and compensation mechanisms for future spills.
Alaska's agricultural sector operates under constraints and opportunities unique to northern latitudes. The Matanuska Valley north of Anchorage produces vegetables during summer months when 19-hour daylight periods accelerate photosynthesis, with cabbage heads reaching 90 pounds and competition winners exceeding 138 pounds. The Alaska State Fair in Palmer has recorded a 138-pound cabbage, a 65-pound cantaloupe, and a 35-pound broccoli crown. The state's short growing season, typically 100 to 120 frost-free days in southern regions and fewer than 60 days in interior areas, limits production to cold-hardy crops. Commercial agriculture contributed 64 million dollars to Alaska's economy in 2019, with greenhouse and nursery products accounting for 20 million dollars, hay production 8 million dollars, and livestock 15 million dollars. Barley grown in the Tanana Valley near Fairbanks during the 1980s supplied a single malting barley operation until declining acreage made production uneconomical. Reindeer herding, introduced to Alaska in 1892 with 16 animals from Siberia, grew to a peak population of 640,000 animals in 1932 before declining to approximately 18,000 animals across 15 herds by 2020. Reindeer sausage appears on restaurant menus throughout Anchorage and Fairbanks, using meat from domesticated herds distinct from wild caribou populations.