Answer:
A. Forced introduction of a national currency.
B. Provided federal contracts to arms and clothing manufacturers.
C. Improved infrastructure particularly in the form of the transcontinental railroad and telegraph systems.
Explanation:
The Civil War was a war between the then Northern States who comprised the Union and the then Southern States who comprised ti Confederacy in an attempt to get the Confederacy to rejoin the United States of America.
The war had many casualties but some good was done to the economy in terms of the following;