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Manifest Destiny is an idea used to express that white settlers are destined by God to expand their territories westwards, spread their ideologies on the land, and put leverages on the Indigenous peoples. Manifest Destiny not only resulted in war with Mexico during the mid-19th century, but in relocation and brutal massacre and mistreatment of the Indigenous peoples, Hispanic, and other non-Europeans, such as afro-descendants, who resided in the territories now occupied by the United States.

Louisiana Purchase
(Or about four cents an acre). After the rapid population growth in the early 19th century, the United States seeks for larger territories in the west where the Indigenous peoples resided. President Thomas Jefferson, therefore, began expanding to the west in 1803 with the Louisiana Purchase, which nearly doubled the size of the United States. On May 2nd, the United States acquired 900,000 square miles of territories, consist of Missouri, Arkansas, Iowa, Minnesota, North and South Dakota, Nebraska, Oklahoma, and the greater part of Kansas, Colorado, Wyoming, and Montana. Two American diplomat, Robert R. Livingston and James Monroe engaged in this negotiation with two French diplomat, Talleyrand and Barbé-Marbois.

Alaska
The purchase of Alaska ended Russian expansion to North America and marked the starting point of the United States' leverage in Asia-Pacific region as a world power. Secretary of State, William Seward and Baron Stoeckl, the Russian minister, agreed the proposal in Washing. The senate approved the treaty of purchase on April 9; President Andrew Johnson signed the treaty on May 28, and the land was formally transferred to the United States on October 18, 1867. There was no visible rules in Alaska after purchase until 1884 when the United States constituted a civil government. Purchase of Alaska was regarded as "Seward's Folly," until the discovery of immense gold deposit in the Yukon in 1896, becoming the gateway to the Klondike gold fields. The strategic importance of Alaska was finally recognized in the World War II.

South Korea
After the United States Army Pacific (USARPAC) chief commander, MacArthur D. receives a surrender submission from Japan on September 2nd, 1945, he established Supreme Headquarter Allied Expeditionary Force in Tokyo, Japan. Under the first general order, he commanded Japanese army to surrender to the chief commander of Far Easter army for those above 38 degrees latitude and to the chief commander of the United States Army Pacific for those under 38 degrees latitude. Immediately after the Japanese surrender, through G.H.Q. U.S. Army Forces, Pacific Proclaim Number 1, MacArthur put Korea south of 38 degrees latitude under the United States military administration, gaining control of all three powers, legal, administrative, and judicial powers, and claiming its sole administration.