What steps did the united states government take to prepare the nation for world war one war?

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.

What kind of contact did christopher columbus and native americans initially have?

What are some inventions during the han dynasty?