Solution:A. John F. Kennedy (1961–1963): Served as the 35th President of the United States, elected in 1960 and assassinated in 1963. His presidency was marked by the Cuban Missile Crisis, the launch of the Apollo program, and early Civil Rights reforms.
D. Richard M. Nixon (1969–1974): Served as the 37th U.S. President. Known for ending U.S. involvement in Vietnam and opening relations with China, but resigned in 1974 following the Watergate scandal.
B. Ronald Reagan (1981–1989): The 40th President, known for his conservative economic policies, military buildup during the Cold War, and the INF Treaty with the USSR.
C. Barack Obama (2009–2017): The 44th President, and the first African-American to hold the office. He passed the Affordable Care Act and led the U.S. recovery from the 2008 financial crisis.
E. Joe Biden (2021–Present): The 46th President, formerly Vice President under Obama, took office in January 2021. His presidency focuses on pandemic recovery, climate change, and restoring international alliances.