By the end of wwi almost soldiers had died.

By the end of WWI over 8.5 million soldiers had died on all sides of the conflict. There were also over 22 million casualties as a result of the world. The "Great War" is remembered as one of the most deadly wars in human history and still to this day is remembered across the world for its mass carnage as a result of war. 

Yes, reasons why is sectionalism compromise of 1850 and secession i hope this