Why blues is the most important musical genre of the 20th centuary

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The other day it hit me that blues is the most important musical genre ever. If blues never had existed then none of todays popular musical genres would exist. Blues inspired Rock n' roll and then rock n' roll inspired pop and those two genres are basicly what has layed the ground for every musical genre that has come from then up til' now. What i would like to know is what inspired the blues. They say that it has it's roots in west africa wich makes sense since the blues was sung by slaves during the slave trading days but other than that i haven't found any answers. If anyone knows anything or have any ideas of your own then please take part in this discussion.