The idea of manifest destiny was the belief that people were destined for expansion across Northern America.
Move west because they couldn't pass the mississippi and thought the soil would be bad for farming
I think the battle of Plattsburg? Try to get other peoples opinions just in case.
We went back to "Undisturbed Isolationism". We cut ourselves off diplomatically for the most part from many European powers out of fear of being brought into another World War. America was completely and only about America.