Answer:
a. California and Oregon were admitted as new states.
Incorrect! California became a state only in 1850
b. The Louisiana Purchase doubled the country's size.
-correct! it took place in 1803
c. Florida became a part of the United States.
-correct! this happened in 1821!
d. New admissions brought the total number of states to twenty-four.
correct! this was achieved in 1821
Step-by-step explanation: