The American counterculture of the 1960's involved the slogan of love and peace, anti-war, young adults who believed in a utopian-like world where everything was free and the world was completely peaceful. If it could be defined by a single word, it would be the hippies that made up the counterculture.
Answer
eventually returned to their home countries
Explanation
Many new immigrants entered in the US in the late 1800 in large numbers and most of them were from western and northern Europe. They fled to US because there was job shortage in their country and also crops farming failed due to their land being infertile and famine.There was also high taxation in their countries. Others were moving to US to seek for freedom due to the political and religion persecution. Many immigrants eventually returned to their home countries this is because in their mind they didn't come for a permanent stay.
Another name for enlightenment period is the age of reason
He served in office from Jan. 20th, 1961 to Nov. 22nd, 1963.