Why was popular sovereignty not an adequate solution to the question of the spread of slavery in the territories

That is because in several states the people chose to have slaves. The idea was that if slaves are to be freed it shouldn't be up to the people but rather the federation, because the people will just vote to have slaves because it suited them to increase their wealth.

Upon the fall of rome, europe ceased being influenced by the cultures of the mediterranean coast and was more influenced by germanic tribal confederations that had already taken over vast swathes of roman territory, although the influence of rome on the former empire was very strong in legal