The American Civil War was a totally seperate issue to the Mexican War. Thats like equating the American War of Independence and saying that it was a direct cause for Vietnam.
If you had to travel five<span> hours to the national capital to work with the central government,</span> it would mostly likely mean this is a unitary system of government, which gives all powers to a single, central power.
<span>The Truman Doctrine was a response to the growing influence of communism in Europe and Asia.</span>
It was signed by Jimmy Carter.