Did you accidentally click history when you asked this question? Not to be rude, but this is a math problem. If it is statistics or something else from past times, then my appologies. I'll be on my way.
The United States economic foreign policy made them successful and prosperous because they had agood combination of isolationist practices which enabled them to not spend money on useless wars or conflicts while at the same time engaging in trade with various nations.
Under the Missouri Compromise on 1820 Missouri got in to the Union as slave state to compromise the balance between slave and non-slave states yet on August 10,1821 the Union restricted the importation of slaves in to Missouri when it became the 24th state.
D the 2 sides are involved in a border dispute