Answer:
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The United States become a global power following the conclusion of WWII. It helped create and oversea international institutions and alliances, such as the United Nations and NATO. It took a more active role in the affairs of countries around the world, and maintained a huge military, rather than downsizing after the war ended.
These actions helped to ensure peace in Europe, but also led to many interventionist wars around the world, such as Vietnam, Iraq, and Korea. It has also led to the United States being in serious debt, largely due to our intense military obligations.
Consumer prices in the United States are a 106.2% higher in Mexico. Consumers prices including rent in the United States is also much higher than it is in Mexico. Ram prices in the United States are more than 270% higher than the are in Mexico. Restaurant prices in the United States are a 126% higher than in Mexico. Grocery prices in the United States are over a 100% higher than in Mexico.
Random attacks by Indian tribes. The frontier had swamps-to-mountainness terrain. Seeds didn't work in all parts of America, some lived healthy in one area while the same seed could die somewhere else there.