They walked across the bering strait which was the land bridge at the time this is the theory
By doing something, idk they must of did something to thrive or whatever you said
Republic, form of government in which a state is ruled by representatives of the citizen body. ... Because citizens do not govern the state themselves but through representatives, republics may be distinguished from direct democracy, though modern representative democracies are by and large republics.
There are 50 states in the USA