I think its a becuse i look back and saw thats what it was
It made the state number even so there were an even number of slave states and non-slave states. It also abolished slave trade in Washington, d.c. becasue many people were angry about there being trading there.
One of the major reasons was that both of their governments worked very differently. While the United States’ government was based upon capitalism and democracy while the Soviet Union’s was based upon communism and dictatorship.