It was the change in immigration laws that imported these replacement populations, it was legislation traceable to and following the 1960 election between Eisenhower’s veep and JFK, the author of the 1958 book, “A Nation of Immigrants”.
Yes! It was Ted Kennedy. The immigration act of 1965. He said, before it was passed.:
“The bill will not flood our cities with immigrants. It will not upset the ethnic mix of our society. It will not relax the standards of admission. It will not cause American workers to lose their jobs.”