Answer:
Yes you should but a comma after Oahu but not after contain. The reason why David is right there is unknown but I'm thinking it was a spelling error.
Explanation:
A dramatic improvement in Colin's health
It expresses that the people are working together to make a more perfect union and make the United States of America a legitimate country with a constitution. The people in power are chosen by the general population, so it's a form of representative democracy.
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