There is a Constitution, and laws set in place that makes USA different from any other country in the world.
There is. Trump doesn't give a shit about it. And does not think he should be subject to it, whether he's president or not. And YouTube is only a reliable source for conspiracy theories.
I'll add that immigrants from all over the world send money home to their relatives, and always have: the Irish, the Italians, the Filipinos, the Chinese, and many more. Eventually, some return home. Others stay here, become naturalized citizens, and bring in family members to do the same.