Which does not describe a change that took place between 1800 and 1821 to the boundaries of the united states?

California and Oregon were admitted as new states, i believe. If its not than im sorry. But it definitely is NOT "florida became a part of the United States" :)

one of the major compromises in the constitutional convention was between the small states and big states. the small states wanted each state to have the same number of representatives in congress. the big states wanted representation based on population.

what are the options?