The ancient Roman and Greek civilizations had well-organized political processes that greatly influenced the manner in which later governments were structured in Europe and the United States. The system of political parties, the establishment of divisions in government -- even political words such as democracy, monarchy and tyranny -- originated in ancient Rome and Greece. Although Rome drew many of its political principles from the Greeks, and as a result, developed a government similar to that of Greece, there were several differences between the two.
If affected American Trade in the west because it prevented the travel through Louisiana, which resulted in less trade, thus an economic defect.
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Robespierre justified it because he said it enabled French citizens to remain true to the ideas of the revolution. Many radicals justified the use of terror by saying that is helped with control.
