Answer:
A duty is what you owe to your fellow human as a fact of nature, and an obligation is what has been imposed by contract or custom. Generally, one is “obliged,” or “obligated,” by agreement or because of having received a benefit. If you take candy from a store, you have an obligation to pay for it.
It's B they wanted the diamonds they had, the oil, land, and slaves
Lewis and Clark, this act was called the Louisiana Purchase
A. The Nullification Crisis led to the promotion of federal power over states' rights.
It was actually outlined in the constitution that states could nullify laws, etc., they deemed that were wrong. However, when South Carolina decided to nullify a law, Andrew Jackson put a stop to it, causing the crisis and almost starting the war then and there. When, prior to the event, states still had a substantial amount of power, President Jackson's response caused states' rights to diminish under the authority of the federal government.