American exceptionalism can best be defined as the belief that -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.

American exceptionalism can best be defined as the belief that B.) the United States had a duty to spread its ideals around the world. The American belief of exceptionalism or uniqueness in relation to other nations around the world is largely centered around what are believed to be enlightened American ideals around issues such as democracy, human rights, and liberal economics. Because of this the United States has taken it upon itself to spread these ideals around the globe.  

The answer is, B.the United States had a duty to spread its ideals around the world.