Why did congress agree to let both territories become a state?

Congress agreed to allow both territories to become states primarily to address the pressing issue of representation and governance in the rapidly growing regions. By granting statehood, Congress aimed to provide the territories with greater autonomy and a voice in the federal government, which was particularly important for maintaining stability and order. Additionally, the decision was influenced by political considerations, including the balance of power between free and slave states in the context of the pre-Civil War era.