USA HISTORY

Detailed explanation-1: -Westward expansion began in earnest in 1803. Thomas Jefferson negotiated a treaty with France in which the United States paid France $15 million for the Louisiana Territory – 828, 000 square miles of land west of the Mississippi River – effectively doubling the size of the young nation.

Detailed explanation-2: -America’s annexation of Hawaii in 1898 extended U.S. territory into the Pacific and highlighted resulted from economic integration and the rise of the United States as a Pacific power. For most of the 1800s, leaders in Washington were concerned that Hawaii might become part of a European nation’s empire.

Detailed explanation-3: -Under the terms of the treaty, Mexico ceded to the United States approximately 525, 000 square miles (55% of its prewar territory) in exchange for a $15 million lump sum payment, and the assumption by the U.S. Government of up to $3.25 million worth of debts owed by Mexico to U.S. citizens.

Detailed explanation-4: -annexation, a formal act whereby a state proclaims its sovereignty over territory hitherto outside its domain. Unlike cession, whereby territory is given or sold through treaty, annexation is a unilateral act made effective by actual possession and legitimized by general recognition.