At the beginning of the 19th century, Mexico fought for independence from the Spaniards. Mexico was an important silver mineral, and most of Spain** was plundered from the American continent and shipped back to Spain. In 1805, Napoleon's army occupied all of Spain, and when Mexico heard the news, he immediately launched an armed uprising in an attempt to get rid of the Spaniards. In 1814, Mexico declared its independence through the Declaration of Independence. In 1821, Mexico declared its independence, and the Central American countries also declared their independence from Spain under the influence of the Mexican independence movement. The Central American countries declared the establishment of a federal republic with Mexico, the United Province of Central America and the United States. With an area of 5 million square kilometers at the time, Mexico was also a regional power. Mexico's territory at that time included California, Texas, New Mexico, and the territory of the five Central American countries.
After the second industrial revolution in the middle of the 19th century, the domestic capitalist economy developed relatively rapidly, and the United States needed more raw materials and markets, so the United States had no choice but to embark on the road of foreign expansion. The United States has set its expansion target on Mexico, which has Pacific ports and land that is exactly what the United States needs for economic development. In 1953, the U.S. wanted to buy Mexican land for $550,000, but Mexico rejected it. The United States instigated Texas to secede from Mexico and declared acceptance of Texas as the 28th U.S. state. War breaks out between the United States and Mexico. The United States sent 150,000 troops to attack Mexico in three directions, and the United States occupied Califolia and Columbia, New Mexico. Mexico had no choice but to sign a treaty with the United States in Guadalupuilgo. Mexico ceded 2.3 million square kilometers of land in New Mexico, Arizona, California, and Texas, and Mexico lost a large amount of land in the north. The U.S. paid $15 million to better appease Mexico.
First, the United States acquired the Pacific Ocean and a large area of land through the Mexican-American War, which covers an area of 2.3 million square kilometers. The United States can only choose to digest the northern part of Mexico before considering the issue of annexing all of Mexico. At that time, the United States was north of the United States with British control of Canada, and if the United States drew troops south of Mexico, there was a possibility that the United States mainland would be attacked by the British. There is a risk that the United States will lose land acquired from Mexico. The United States can only choose to digest this land.
Second, the United States Although the United States won this war, the United States also paid a huge price, and the number of American troops killed was 130 thousand. The United States also paid $97.5 million, and if the United States chooses to expand the scale of the war, the more the United States spends, and the economy can have more problems. The Western powers will not let the United States dominate, and the great powers will support Mexico, so it will be more difficult for the United States.
Third, domestic contradictions in the United States are quite prominent. In the early days of independence, there was a heated debate in the United States about the retention of black slaves, and the states of the United States coordinated to abandon the issue for the time being. As the United States expanded more and more, the problem of black slavery also became more prominent. The problem was finally resolved domestically through the Civil War. At that time, U.S. law required new states and states to choose the system.
Fourth, there were not many people in northern Mexico, and the United States had already migrated to northern Mexico in large numbers before the war. One of the main reasons the United States was able to win the war was the presence of American immigrants in the north. Southern Mexico is full of Mexicans, and if the United States annexes southern Mexico, it will take more manpower and force to solve this problem.
Mexico was ceded 2.3 million square kilometers of land by the United States, or about 55 percent of the land area. Mexico currently has a land area of only 1.97 million square kilometers, and Mexico's economic development is in serious difficulty, and the United States has ceded this land to have rich oil and natural gas, copper mines, tin ore, and other resources to make the American economy develop better. It is also in this situation that the United States is better able to develop its own economy.