In advocating for the League of Nations, Wilson wanted to create a unity between nations in order to avoid the same issues that led to World War I. Unfortunately the US rejected this proposal.
Wanted to unite all of South America into a single nation--> Simon Bolivar
Led a large group of American Indians and Mestizos against the Spanish--> Padre Miguel Hidalgo
Defeated Napoleons army to win independence from France--> Toussaint L'Ouverture
Supported Brazil's independence after Portugal was invaded by France--> Dom Pedro
These leaders were responsible for gaining the independence of their countries and/or regions from European colonial leaders. Bolivar liberated South America from Spain and Hidalgo did so for Mexico as well. L'Ourverture led the revolution in Haiti against the French. Pedro supported the only bloodless revolution in Brazil from the Portuguese. All of these movements occurred in the early 1800's which almost entirely ended 300 years of colonization in the Americas
Answer: the rules established by the federal government for determining who is allowed to enter the country, and for how long.
The answer is ex post facto laws