The federal courts of appeal :))
The expansion of the railroads in the late 1800s was instrumental in helping the US economy boom. It did this in two ways. First, the railroads created a tremendous amount of demand for goods and labor on their own. As the railroads were being built, they needed huge numbers of people to build them.
Explanation:
It was on April 1775, that the battle of Lexington occurred, which was a then followed by the battle of Concord. The shot at Lexington marked the first blood spilled in the war of the American independence.
hope this helps ..