Disadvantages, I believe, but am not sure are factual, were with a strong executive branch, the people feared that the president would manipulate his powers, just like the king of England had done so with the colonies and those who disagreed with it thought that the smaller sates wouldn't be voiced.
As part of his Reconstruction plan, President Johnson thought the South should be treated relatively fairly, compared to how the radicals in Congress thought they should be treated.
General jean-baptiste kléber
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Eastern parts were richer and more populated, while western part had a symbolic value (Rome). All in all, western half collapsed quickly and doesn't have great impact on history. Eastern half is the Byzantine empire, which had a great impact on eastern Europe, it basically "created" Bulgarian, Serbian and Russian empires (of which only Russian managed to survive long enough to become a world force) and (Byzantine ) had a great influence on Ottoman empire.
hope this helps ;)
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