CH Links
https://www.youtube.com/watch?v=6E9WU9TGrec
http://ap.gilderlehrman.org/period/1
http://ap.gilderlehrman.org/period/2
https://www.youtube.com/watch?v=1FdK2bfstEs&t=4s
https://www.youtube.com/watch?v=DORfPGMv-kc&t=183s