In the 1850s the term bleeding kanas referred to

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.