Which law was created in order to keep balance of power between slave and free states in the union

 Heres a answer.  In the years leading up to the Missouri Compromise of 1820, tensions began to rise between Pro slavery and anti slavery factions with the U.S. Congress and across the country. They reached a boiling point after Missouri's 1819 request for admission to the Union as a slave state. hope you mark me as brainiest plz. anyways have a good day.