Answer:
A) Colorado, the Dakotas, and other territories became states
Step-by-step explanation:
As Colorado, The Dakotas became more and more populated, the settlers didn´t have a real estructure for their government, that also meant that they had no means to defend themselves from foreign invasion or a colonization attack, so in order to be able to defend themselves and be part of an organized government they were annexed to the United States.