During that period, he was involved in the negotiations for the Alaska Purchase.
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With the United States Alaska Purchase of 1867, Sitka became the headquarters of the Military Department of Alaska under U.S. Army Major General Jefferson C. Davis.
While the post was in Russian America, the Hudson's Bay Company continued to trade there until the American traders expelled it in 1869, following the Alaska Purchase when the Alaska Commercial Company took over the post.
A Russian Orthodox Church consecrated to Saints Sergius and Herman of Valaam was built in the community in 1870 (only three years after the sale of Alaska by Russia to the United States).
Etolin Island, Alaska, was named Duke of York Island until it became American territory with the Alaska Purchase of 1867