Joan of arc introduced new battle strategies and incorporated older ones to succeed in 9 out of 13 of her battles in the 100 year war
I think it’s because of the tactics and general. Robert E Lee was deployed in the East since Richmond was their Capital. Lee was a tactically aggressive commander and far more competent than the mediocre Southern generals in the West. Though he took an enormous number of casualties, he turned back McClellan's forces in the Seven Days battles. but then Richmond fall
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Separation of powers is a model that divides the government into separate branches, each of which has separate and independent powers. By having multiple branches of government, this system helps to ensure that no one branch is more powerful than another.
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