Alaska became a US territory after the United States

August 24, 1912

Explanation:

Purchased the land

Explanation:

On October 18, 1867, the U.S. formally takes possession of Alaska after purchasing the territory from Russia for $7.2 million, or less than two cents an acre. Nevertheless, Congress eventually ratified the Alaska deal.

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.