A half-century ago, much of the world was in a broad state of change: We were moving out of the post-World War II era, and into both the Cold War and the Space Age, with broadening civil rights movements and anti-nuclear protests in the U.S. In 1961, John F. Kennedy was inaugurated as the 35th president of the United States, Soviet cosmonaut Yuri Gagarin became the first human to fly in space, Freedom Riders took buses into the South to bravely challenge segregation, and East Germany began construction of the Berlin Wall. That year, Kennedy gave the okay to the disastrous Bay of Pigs Invasion into Cuba and committed the U.S. to "landing a man on the Moon" with NASA's Apollo program. JFK also oversaw the early buildup of a U.S. military presence in Vietnam: by the end of 1961, some 2,000 troops were deployed there. Let me take you 50 years into the past now, for a look at the world as it was in 1961.