Who has the power to admit new states to the united states?

Congress

New states can be created by the Congress.

The Congress acts through a system of specialized standing committees in both Chambers. The Senate is the most powerful House of Congress, as its approval is required for important federal nominations and for ratification of international treaties. The president's political program needs congressional approval.

answer; i do believe its (b) 12.5 years of age;

mali had been a state inside of the ghanaian empire. after ghana fell because of invading forces and internal disputes, mali rose to greatness under the leadership of a legendary king named sundiata, the "lion king." the songhai empire, already weakened by internal political struggles, went into decline.