March,
definitly, and you should listen to some march pieces.
One way literature affected history was before the American Civil War. The book "Uncle Tom's Cabin" by Harriet Beecher Stowe caused the start of the American Civil War. Slavery wasn't a big deal until Harriet wrote this book. Abraham Lincoln the 16th president, confronted Harriet about the book. He spoke to her about it and he realized that slavery has to be stopped. The south refused. The Civil War started.
Literature can lead up to conflict or hatred between others, It can cause wars, street fights, and arguments. Literature can give people the right or wrong idea. Positive literature puts people on track to the right side of things. Negative literature would throw them off to believe the wrong thing.
An example of literature affecting history is our current presidency. But, we're not gonna go into detail about that. :)
Hopefully i helped!
