What is needed for a territory to gain statehood according to the Constitution?

For a territory to gain statehood according to the U.S. Constitution, approval by Congress is essential. This process is rooted in Article IV, Section 3 of the Constitution, which grants Congress the power to admit new states into the Union. While other elements may be involved in the transition to statehood, such as the drafting of a state constitution or local popular support, the final authority lies with Congress. It serves as the legislative body that assesses and grants admission, ensuring that the new state meets necessary criteria and aligns with national interests. This emphasis on congressional approval helps maintain a cohesive and organized approach to the expansion of the United States.