What are some important lessons to be learned from the civil war?

The first one i would say would be a true leader takes the blame and big egos equals big failures, And you decide when you are defeated , keep your eyes on the prize, be flexible about your approach, there are many more but these are the most important ones to me @(^_^)@

Hope it helps

whose power in the senate is equal to the power of the speaker of the house?