The last non-screwed-up generation in the USA was probably prior to the Civil War. However, in the 19th century, many communities in the USA were healthy. Heck, even in the 20th century, many rural communities produced good, strong, sane people who upheld the ideals of Western Civilization. However, although the 1950s seem like a paradise in hindsight, they were largely an accident of temporary industrial prosperity. Plenty of Americans in the 1950s were fornicating and contributing to social degeneracy.