Let's not forget #Alaska
The U.S. purchased the territory of Alaska from Russia on March 30, 1867, for $7.2 million. Although the purchase soon proved to be an exceptional value, the deal was criticized at the time as "Seward's folly," referring to then-Secretary of State William Seward, who had engineered the purchase. Alaska officially became a U.S. state on January 3, 1959.
https://www.newsweek.com/alaska-ours-billboards-appear-russia-after-threat-reclaim-state-1722761
