What will happen to the balance of slave and free states once The United States gains more territory

If there were even one more slave state or free state, the balance of power would shift in the Senate, and would likely shift in the House as well. Compromises were needed to equalize the power between proslavery and antislavery interests in the government to keep the Union together.

https://www.encyclopedia.com/humanities/applied-and-social-sciences-magazines/balance-between-free-and-slave-states-overview

Explanation:

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the most famous of all the units fighting in cuba, the "rough riders" was the name given to the first u.s. volunteer cavalry under the leadership of theodore roosevelt. roosevelt resigned his position as assistant secretary of the navy in may 1898 to join the volunteer cavalry. the original plan for this unit called for filling it with men from the indian territory, new mexico, arizona, and oklahoma. however, once roosevelt joined the group, it quickly became the place for a mix of troops ranging from ivy league athletes to glee-club singers to texas rangers and indians.