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he pre–Civil War years (1820–1860, or the “antebellum years”) were among the most chaotic in American history—a time of significant changes that took place as the United States came of age. During these years, the nation was transformed from an underdeveloped nation of farmers and frontiersmen into an urbanized economic powerhouse. As the industrialized North and the agricultural South grew further apart, five major trends dominated American economic, social, and political life during this period.
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Events That Led to the United States Involvement In World War II World War II was a war that proved to the world the awesome power of the United States. Many events led up to the U.S. involvement in the war, topped off by the Japanese attack of Pearl Harbor. Many great people contributed to leading the United State to victory in the war.
The battle of Tours united Christians against Islamic expansion and this among the following events allowed Christianity to act as a unifying force in Medieval Europe. The correct option among all the options given in the question is the last option or option "d".