Cultural shock, Cold War rules of engagement, lack of recognition, Racial divide and social class issues, constant changing of personnel, high casualties, morale issues and a determined enemy.
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The southern economy was primarily agrarian (farms) while the north was heavily industrialized.
The North American Free Trade Agreement had the most Impactful event in the history of United States during Clinton administrtation. This was the agreement between Mexico, Canada and the United States about the removal of barriers for excahnge of goods and services between these three countres.