Montenegro became the 29th country to join NATO.
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Germany invaded France during WWII.
Uncle Tom's Cabin, an anti-slavery novel by Harriet Beecher, was first published.
NASA's STS-40 became the first spaceflight with three women to be launched into space.
Registration of US men aged between 21 and 31 began for troops for WWI.
The District Court ruled that segregation was unconstitutional in Montgomery.
