What are some of humans’ great historical transitions?

The idea of manifest destiny simply stated it was america's destiny to expand from the atlantic ocean to the pacific. the word "destiny" implies an idea that it was within our rights as a nation to expand. in a paragraph of 125+ words, explain what could be wrong with that idea.

Was the civil war inevitable? could anything have been done through compromise to stop it, or did it have to happen?

Which group was responsible for determining the borders of african colonies and later countries