I live in the UK and it would be a dream come true for me to live in USA (preferably NY!); to be clear, does the USA only accept immigrants from the UK who a) Are moved there through their work, b) Marry a US citizen or c) Have a ton of cash, therefore can support themselves in the US?

My question would therefore be; how do a lot of people from eg India, Pakistan and the like move there and get jobs as taxi drivers, etc.?

Here is the page on immigration information from the U.S. State Department:

[travel.state.gov]