What was the missouri compromise? How did it affect our relationship with mexico?

The Missouri Compromise was meant to create balance between slave and non-slave states. But I don't know how it affected Mexico

How did the Missouri Compromise contribute to the Civil War? Others felt that it made the north seem more aggressive in its anti-slavery views and contributed to southern resentment, which may have led to the Civil War occurring sooner. The Missouri Compromise was meant to create balance between slave and non-slave states.