A Country's immigration percentage in the world is the highest in America. Here is a list of the highly skilled migrants from different parts of the world that poured into the US as reported in 2007. These are the most visa H-1B recipient countries. India is in the top position in this list of highly skilled migrant workers in the U.S. The U.S. owes a lot of its economic power to migrant workers. Source: U.S. Dept. of Homeland Security, Office of Immigration Statistics.