From which countries came the people of the migration boom of 1910-1920? and how many where they in total?

About 14 million people immigrated to the U.S. between 1910-1920, with the pace slowing considerably in the mid-to-late-1910s because of World War I. The most immigrants came from Italy, with other southern and eastern European countries such as Germany making up the remainder. Very few people came from Asian, South American, or African nations due to immigration quotas.

but now 300 .0000000 US population ^60% mexico all get free ride to hospital next 10 years will 500 millions and mexico city empty all dump to here

Mexico.. about 73,000 people.. due to the Mexican Revolution...

Source: www.dickinson.edu/departments/econ/