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The Romans established a form of government -- a republic -- that was copied by countries for centuries. In fact, the government of the United States is based partly on Rome's model. The ladder to political power in the Roman Senate was different for the wealthy patricians than for the lower-class plebeians.
Joseph Stalin ruled the Soviet Union during WWII
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In my personal opinion exploration had a big impact because without it we probably wouldn't have gotten to the point in life that we are in. we wouldn't have knowledge of the 50 states and all of the countries there are in the world.
hope i helped