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The territorial expansion of the United States 1803, the United States threatened to unite Britain against France and demanded to buy New Orleans at the southern tip of Louisiana. At that time, France failed to suppress the Haitian revolution, and Napoleon wanted to go to war with Britain, which could capture New Orleans at any time. So, France took the initiative to sell the whole Louisiana to the United States, and finally sold it for150,000 US dollars. 18 10, parts of west Florida declared independence, and the United States annexed it immediately; Later, the United States occupied East Florida under the pretext of chasing Indians. 18 19, Spain was forced to sign a treaty with the United States, and the United States "bought" Florida for $5 million, but did not pay for it. At that time, a large number of American immigrants settled in Texas, Mexico. 1835, there were 30,000 American immigrants. This time, the Mexican government announced the abolition of slavery in Texas, and American immigrants launched riots and defeated the Mexican army that came to crusade. The following year, American immigrants established the "Lone Star Republic" and applied to join the United States. From 65438 to 0848, Texas became the 28th state in the United States. After the annexation of Texas, the American government immediately turned its attention to the rich California. 1846, the United States provoked a war against Mexico, and then incited rebellion in California, announcing the establishment of the "Republic of California". The Mexican army was defeated. 1In September, 847, the United States invaded Mexico City. In February of the following year, Mexico was forced to sign a peace treaty to cede California, Arizona and New Mexico, and the United States paid Mexico $150,000. 1853, the United States forcibly purchased the land in the Kira Valley at the southern tip of Arizona for100,000 dollars. In this way, Mexico lost about 55% of its land. During this period, the United States and Britain competed for Oregon. First, in 18 18, it was awarded to jointly manage Oregon with Britain. 1846, the United States once again threatened war, forcing Britain to give up Oregon south of 49 degrees north latitude. 1867, Alaska was purchased from Russia. Thus, by the middle of the19th century, the territory of the United States had expanded from 2.05 million square kilometers in 1783 to 7.77 million square kilometers.