What are the causes of many empires falling?

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.

Large igneous rock have been found on surface sedimentary bedrock in north carolina .which statement best xplains the presence of these boulders

What mountain range is located near 60*n and 60*e