United States: green cards granted to the Americas 1820-2019, by country and decade

In all decades until the 1960s, Canada was the most common country of origin for immigrants to the United States from other parts of the Americas. This changed with the introduction of the Immigration and Nationality Act of 1965, where migration became easier for those from countries in the Global South, while Canadian migration fell due to the rising prosperity in the country. Since the 1960s, Mexico has consistently been the most common country of origin for immigrants to the United States in each decade, and its all-time total is now the highest in the world. Outside of North America, the Caribbean was the region with the highest level of migration to the U.S., particularly from Cuba and the Dominican Republic, and the region's all-time total has now overtaken that of Canada (additionally, it should be noted that Caribbean figures do not count Puerto Rico or the U.S. Virgin Islands: both territories of the United States).