Through the process of elimination, all other answers meet the requirements of the Monroe Doctrine. Though deportation and nativism was strong at the time of its conception, it had little to do with the doctrine itself.
The Monroe Doctrine was an American policy of keeping the North and South American continents as free of European influence and colonization at that current point in time; however, they would still recognize the current colonies. It was a way of creating the United States sphere of influence and not interfering outside of it in any European conflicts as Washington had counseled.
