Millions came from Europe, especially a mass Immigration from Italy. Also, thousands came from China to work as laborers on the railways.
To escape religious persecution.
People emigrate from their country of origin. They immigrate to the country which they are going to. People emigrate from anywhere.
No they don't. People emigrate but not because of communism.
US visa.
an airplane
why did so many people emigrate from britain in 1830-1930 ?
no
People who emigrate to another country are usually looking to start a better life than they have in their current country.
Something will backfire. I would think that there would be fewer opportunities for people to emigrate to the US.
To gain more money.
rice.
The "American dream". See related questions for further details.