The document summarizes the Russian colonization of Alaska and California between the 18th and 19th centuries. Russian explorers established trading posts in Alaska, the Aleutian Islands, Hawaii, and Northern California beginning in the 18th century. By the 19th century, Russia had established colonies in Alaska and California, with populations of around 4,000 and 150 people respectively. However, due to financial difficulties, Russia sold Alaska to the United States in 1867 and abandoned its California colony in 1841.