What was a major effect of the columbian
exchange?
(1) economic collapse in europe
(2) introduction of new food crops to europe
(3) decrease in european population
(4) expansion of democratic rights throughout
europe

The main reason the us senate rejected the treaty of versailles was because, isolationists felt the us should not have gotten into the war. republicans had gained power in the senate. democrats had gained power in the senate. european nations wanted to punish germany.