The correct answer for the question that is being presented above is this one: "the construction of nuclear missile sites in Cuba." The action led to the Cuban Missile Crisis is the construction of nuclear missile sites in Cuba. <span>Krushchev, the communist leader of the USSR armed Castro (Cuba) with nuclear weapons which were discovered by an American plane.</span>
- economic disputes (restrictions of u.s trades)
- Royal Navy’s impressment of American seamen
(Keep in mind you didn't list any reasons so it would be kind of hard to answer)
One important advantage that primary soruces have over secondary sources is that primary sources offer a firsthand account of an event - b, which isn't the case with secondary sources. Although this leaves primary sources prone to being biased compared to secondary sources.
