The last remaining nuclear arms pact between Russia and the United States is set to expire this week, removing any caps on the two largest atomic arsenals for the first time in more than a half-century. The end of the New START Treaty sets the stage for what many fear could be an unconstrained nuclear arms race. Russian President Vladimir Putin has declared his readiness to stick to the treaty's limits for one more year if Washington follows suit, but U.S. President Donald Trump has been noncommittal about extending it. Arms control advocates have warned that the treaty's termination would fuel a renewed arms race.

On June 18, 1812, the War of 1812 began as the United States Congress approved, and President James Madison signed, a declaration of war against Britain.

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On June 18, 1983, astronaut Sally K. Ride became America's first woman in space as she and four colleagues blasted off aboard the space shuttle Challenger on a six-day mission.

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In 1778, American forces entered Philadelphia as the British withdrew during the Revolutionary War.

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In 1778, American forces entered Philadelphia as the British withdrew during the Revolutionary War.

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In 1586, English colonists sailed from Roanoke Island, N.C., after failing to establish England’s first permanent settlement in America.