American exceptionalism can best be defined as the belief that

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the United States could acquire territory by force because US troops were exceptional.

the United States had a duty to spread its ideals around the world.

Oregon Country should be different from other Northwestern territories.

Oregon Country was an exception to British possessions in the West.

the United States had a duty to spread its ideals around the world.

Explanation:

American exceptionalism is the worldview of national exceptionalism, according to which the United States occupies a special place among other peoples in terms of its national spirit, political and religious institutions. A key element of American exclusivity is the assertion that the United States and its people are different from other nations as a union of people who come from all over the world, but who share a common position in upholding certain self-evident truths, such as freedom, inalienable human rights, democracy, republicanism, the rule of law, civil liberties, civic virtues, the common good, justice, private property and constitutional government.

The religious and ideological basis of the Puritans was the concept of comparing their own history and the history of the "children of Israel." This kind of comparison with the "God chosen people" shaped the idea of chosenness, and later on the exclusivity of the American nation.