In what ways, if any, does the monroe doctrine continue the american policy of neutrality

The Monroe Doctrine is the denomination given to the approach that the US adopted in foreign policy in 1823, explicitly stating its oposition to European colonialism in America. The US expressed its intentions by claiming how any attempt undertaken by a European nation which aimed to gain control over an American territory would be regarded as "the manifestation of an unfriendly disposition towards the US", and the US would respond to such offense in consequence.

The only manner in which the Monroe Doctrine kept a certain sense of neutrality was the fact that the US would not interfere in those American territories that were already under European control.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

i would go with the last one