What are the three most consequential demographic changes to have taken place in the U.S. in the 20th century? What were their biggest consequences?

What are the three most consequential demographic changes to have taken place in the U.S. in the 20th century? What were their biggest consequences?

What are the three most consequential demographic changes to have taken place in the U.S. inthe 20th century? What were their biggest consequences?AnswerThe three most important consequential...