If Rome was defeated at the battle of Zama then there wouldn't have been a Roman empire after that, and Carthage would have won the second punic war, leading too the destruction of Rome itself
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They brought different things with them, like different beliefs and religions. They also brought different technologies as in tools.
George Washingtons presidency was vital in the development of young America. Washington was a trusted figure, a war hero, he lead America to its independence during the Revolutionary war. The citizens of the united state followed him with their trust.
Washington set many of the precedents for the president that are still followed to this day, for example the two term limit was established after he retired, only to be broken by FDR and it was later instated as a law. Without George Washington America would have been extremely different.
