The assassination of John F. Kennedy on November 22, 1963 lead to the Vice-President Lyndon Johnson becoming president of the United States, Johnson continued Kennedy's civil rights program and escalated the war in Vietnam. Elected in 1964 in his own right, he did not run again in 1968 because of opposition to the Vietnam War.
I think D but don’t count me on it!
European exploration, exploration of regions of Earth for scientific, commercial, religious, military, and other purposes by Europeans, beginning about the 4th century BCE.