To escape religious persecution.
no
US visa.
an airplane
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.
The "American dream". See related questions for further details.
Very simple: they want to gain many US dollars.
Hard to get a job,few freedoms,not enough food to make it , and not being able to worship who they desire.
US customs ran a strict quota system where only a certain number of people could enter from any country.
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I believe it was England, however the modern form was popularised in the US.