The history of Alaska dates back to the end of the Upper Paleolithic Period (around 12,000 BC), when Asiatic groups crossed the Bering Land Bridge into what is now western Alaska. At the time of European contact by the Russian explorers, the area was populated by Alaska Native groups. The name "Alaska" derives from the Aleut word alaxsxaq, meaning "mainland" (literally, "the object toward which the action of the sea is directed").
The first European contact with Alaska occurred in the 1741, when Vitus Bering led an expedition for the Russian Navy aboard the St. Peter. After his crew returned to Russia bearing sea otter pelts judged to be the finest fur in the world, small associations of fur traders began to sail from the shores of Siberia towards the Aleutian islands. The first permanent European settlement was founded in 1784, and the Russian-America Company carried out expanded colonization program during the early to mid-1800s. Despite these efforts, the Russians never fully colonized Alaska, and the colony was never very profitable. William H. Seward, the U.S. Secretary of State, engineered the Alaskan purchase in 1867 for $7.2 million.
In the 1890s, gold rushes in Alaska and the nearby Yukon Territory brought thousands of miners and settlers to Alaska. Alaska was granted territorial status in 1912.
During World War II, three of the outer Aleutian Islands—Attu, Agattu and Kiska—were occupied by the enemy. Their recovery became a matter of national pride. The construction of military bases contributed to the population growth of some Alaskan cities.
In 1964, the massive "Good Friday Earthquake" killed 131 people and leveled several villages.
The 1968 discovery of oil at Prudhoe Bay and the 1977 completion of the Trans-Alaska Pipeline led to an oil boom. In 1989, the Exxon Valdez hit a reef in the Prince William Sound, spilling between 11 and 35 million US gallons (42,000 and 130,000 m³) of crude oil over 1,100 miles (1,600 km) of coastline. Today, the battle between philosophies of development and conservation is seen in the contentious debate over oil drilling in the Arctic National Wildlife Refuge.