What happened early in John F. Kennedy's presidency at the Bay of Pigs in Cuba? A. Soviet missiles shot down a commercial airliner that was flying from Miami to Havana.
B. A CIA-trained force of Cuban refugees launched a failed attempt to overthrow Fidel Castro.
C. The Cuban people rose up and forced Soviet advisors to evacuate the island.
D. Fidel Castro led communist guerillas in an invasion that deposed the corrupt government.

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.