Answer:
the united states would decline just as the Roman empire
The King or the Lord of the land would be the greatest authority in the feudal system.
To gather a large population of the people they were against efficiently to concentration camps, usually to clear ghettos without liquidation.
The manifest destiny was essentially the US saying that everything to the west is rightfully theirs and God gave it to them. This was trouble for the native americans that lived in the region as the US would send forces to relocate them to other areas that they had never been to before. In sum, the manifest destiny was a version of American Imperialism.
