USA HISTORY

Detailed explanation-1: -The United States and Great Britain signed the Treaty of Oregon on June 15, 1846, ending 28 years of joint occupancy of the Pacific Northwest .

Detailed explanation-2: -In 1846 Britain and the United States signed the Oregon Treaty, extending the international border between the U.S. and what would become Canada along the 49th parallel to the Strait of Georgia, and then out the Strait of Juan de Fuca.

Detailed explanation-3: -On August 14, 1848 the United States congress approved the formation of the Oregon Territory. At the time the Oregon Territory included all of the present day states of Oregon, Washington, Idaho, and parts of Montana and Wyoming.

Detailed explanation-4: -The Western Frontier was the last great place to be settled by the U.S., and U.S. Citizens wanted that land to be theirs. The land was optimal for farming and had plenty of space to spread out from the over populated cities. U.S. Congressional Map on states that had formed from the Oregon Treaty.

Detailed explanation-5: -By its terms, Mexico ceded 55 percent of its territory, including the present-day states California, Nevada, Utah, New Mexico, most of Arizona and Colorado, and parts of Oklahoma, Kansas, and Wyoming.