What determines how many representatives each state has?

The first ones say not more than 2 representatives for a state 

The native americans, spanish, french and americans all name places in our state. the word “arkansas” came from the quapaw indians, by way of early french explorers. at the time of the early french exploration, a tribe of indians, the quapaws, lived west of the mississippi and north of the arkansas river.

Britishgovernment ohoman