Answer:
==> The murder of Martin Luther King Jr.
==> Vietnam War.
==> Watergate Scandal.
Explanation:
(1). The murder of Martin Luther King Jr.: During those years, there was political unrest which lead to the deaths of many politicians. The assassinations did not exclude the leaders of civil Rights movement like Martin Luther King Jr.
(2). Vietnam War : the Vietnam War according to history started in the year 1 Nov 1955 on the 1st of November and ended in the year 1975 on the 30th day of April. The Presidents during the Vietnam war are Dwight D. Eisenhower, Lyndon B. Johnson, Richard Nixon, Gerald R. Ford and John F. Kennedy. The Vietnam is one of the international challenges the United States of America faced.
(3). Watergate Scandal: was the scandal that made the President( Richard Nixon) to resign from his post as the President of the United States of America.
