The main thing is the language. Mexicans speak Spanish while United States citizens speak English. They also use different currencies and have different economies. They also have a different government systems because Mexico does not have a large amount of states that are bound together in a Union. Mexicans also don't invade or meddle in foreign affairs of countries while the US is usually involved in missions with the United Nations.
Hope this works!!!!!!!!!!!!!!
The answer is 200 your welcome