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The formation of the united nations
When comparing and contrasting an ancient government with the current US government I would recommend looking at the government of Ancient Athens, since Athens had a democracy like the US, except theirs was a "direct democracy," instead of a "representative" democracy--which would make this a good comparison point.
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The westward expansion led to many other events in and around the United States. Before Manifest Destiny and the westward expansion the French and Indian War and Revolutionary War took place which allowed America to declare independence. There's no telling weather its positive or negative, but it leans more on the positive side, because of its impact.
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