Yes to the first part...HELL NO(!), to the last bit!
Europeans still wanted to come here...Teddy did NOT want them here at all. He was the originator of turning this once great nation into a hellhole, where people like him ( white lefties) ruled over a majority of "shithole" nations' detritus.
I couldn't remember. "After Kennedy's assassination that November, Congress began debating and would eventually pass the Immigration and Naturalization Act of 1965, co-sponsored by Representative Emanuel Celler of New York and Senator Philip Hart of Michigan and heavily supported by the late president's brother, Senator Ted Kennedy ."
Defer to your research on the second part. I do know there is resentment to this day by Irish Catholics to Protestants, not all.