What was the primary reason a national court system was established?

The U.S. Courts were created under Article III of the Constitution to administer justice fairly and impartially, within the jurisdiction established by the Constitution and Congress.

Explanation:

The U.S. Courts were created under Article III of the Constitution to administer justice fairly and impartially, within the jurisdiction established by the Constitution and Congress.

Explanation:

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.  

try c, it's always the answer. pats suck.