USA HISTORY

Detailed explanation-1: -The Oregon Treaty between the U.S. and British. Signed by President James K. Polk on June 15th, 1846.

Detailed explanation-2: -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-3: -In July 1845, however, Polk proposed a compromise to the British, offering to establish the boundary at the 49th parallel while granting Britain full control of Vancouver Island. With war in Mexico appearing ever more likely, the President wanted to avoid a simultaneous war with Britain.

Detailed explanation-4: -James Knox Polk was the 11th president of the United States of America (1845-1849). As President he oversaw the largest territorial expansion in American history-over a million square miles of land-acquired through a treaty with England and war with Mexico.

Detailed explanation-5: -The war officially ended with the February 2, 1848, signing in Mexico of the Treaty of Guadalupe Hidalgo. The treaty added an additional 525, 000 square miles to United States territory, including the land that makes up all or parts of present-day Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming.