Why did the union wanted control the west during the civil war in America

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During the American Civil War (1861–1865), the Union, also known as the North, referred to the United States of America, specifically to the national government of President Abraham Lincoln and the 20 free states and 5 border states that supported it. The Union was dedicated to the defeat and termination of the Confederate States of America, informally called "the Confederacy" or "the South".

The Union Army was a new formation comprising mostly state units, together with the fewer units from the regular U.S. Army.

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b. germany and italy

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation: