Yes, it is true that ground <span>fighting in the Pacific was led by the United States marines, since these soldiers were almost always deployed via ships, as opposed to other more land-based means. </span>
1. it stopped the spread of slavery north of the Ohio river
This depends greatly on the time period in question, but during the Enlightenment, many Europeans believed "the citizens" were in charge of all things including governmental systems.
World War I generated jobs at home in England and in the military.