Claiming the Civil War was fought over state's rights or tarriffs is a loathsome attempt to obfuscate the primary motivation for the South's bid for independence.
Ten years is an arbitrary number you pulled right our of your ass. If you want to blame anyone for the Civil War blame the Southern aristocracy for starting it to preserve the South's slave based economy. The Reconstruction era accelerated the enfranchisement of blacks and the granting of full civil rights to them.Slavery's days were numbered. Mechinization would have ended slavery in another 10 years and everyone knew it and it didn't take a war, billions of dollars in destroyed property and a half million lives to make that happen.