"America in the 20th Century" series: "The 60s" YouTube Link...  This is the easiest, most concise approach to comprehending this bit of our history.
https://www.youtube.com/watch?v=qWWQk7J6cQY

The Century: America's Time - 1965-1970:  Awesome overview of the social turmoil and activism throughout the 60s. 
https://www.youtube.com/watch?v=jET2qR8Y-Ng

1960s Counterculture (20 min.) VERY helpful: 
https://www.youtube.com/watch?v=oZnAXqvGnJQ