Explain how the Monroe Doctrine changed the way the United States dealt with foreign powers.

The Monroe Doctrine explained that both North and South America were no longer open to colonization by Europeans.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.