Historical legacy of riots in the U.S.?

I'm looking for a resource that puts U.S. riots on a timeline, and then explains what material changes came out of it. For example, "X riot led to Y and Z changes in policing/legislation/civil rights, etc." Bonus points if the timeline goes all the way back to the Civil War and runs up to present day. via /r/communism https://ift.tt/2MxNo1N