Answer:
Philip II's most important achievement in Greece was uniting Greece with his powerful army, wealth and political skills. He united Greece by using a common enemy, Persia, and by honoring the local traditions of his conquered lands.
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The colony became vastly richer due to the diamond deposits. Even locals happened to gain a lot form it and there is a famous example of a woman who was married to a Portuguese official who died wealthy and could buy anything she wanted. Of course, the working conditions were harsh for the workers.
You did not include a timeline, but the American civil war lasted from 1861 to 1865