This is a really silly comment and shows how uniformed you are. No offense. But I'm going to try and have some patience with you. Blues is the "blackest" genre in the United States, but more importantly it is the root and foundation of African American music(and American popular music in general). It along with gospel are also the root and foundation of African American culture. The blues development started in...You guessed it... Slavery. And then it was fully developed by the early 20th century, specifically when radio was invented. But more importantly it developed in the south, where the majority of the AA population lived. It defined the AA culture and struggle at that time. Hell blues is the ROOT of AA non-religious secular culture. The "vices" of black American such as drinking, partying, sex, smoking dope,etc. Blues defined all that. If it weren't for the blues not only can you just forget about your Hip Hop and R&B, but AA's would be more religious than we are today. Yes it defined ALL the things you listed and its roots are still seen today.
Its sad that my white professor understands(and know this), but you as a black person does not.