SUPER IMPORTANT The Monroe would be cited as a precedent by many future presidents. William McKinley used it to justify the Spanish-American War. Theodore Roosevelt used it to build the Panama Canal. JFK would cite it when he blocked Soviet ships from Cuba. *
Doctrine
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Diplomacy

Doctrine

Explanation:

It was used during the Cold War Era when JFK invoked the MD  - he ordered a naval and air quarantine for Cuba because the Soviets were building missile launching sites.  

doctrine

Explanation:

the answer is a) the proclamation of 1763.

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so.