Isaac Netwon is a world famous scientist and physicist whose ideas and discoveries have shaken the very grounds of physics at the time and the predictions that he made at the time are still considered today to be fundamental in terms of knowledge. His ideas also moved philosophers in various ways to think about different metaphysical topics that were related to his work.
They developed new products and inventions. And I think they started a number of new business
As far I know a u.s. citizens has the right to vote, be able to travel with a U.S. passport, be able to apply for a federal government jobs and to petition for a close relative to come live in the U.S and all of these stuff cannot do an alien resident.