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1797 - The US Navy frigate USS Constitution is launched in Boston harbor.

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1861 - Battle of Balls Bluff, Virginia.

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1872 - The Treaty of Washington is signed by Canada and the USA, settling the "Pig War" of 1859, establishing the final boundary between the USA and Canada, granting the USA sole and permanent possession of San Juan Island, south of Vancouver Island.

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1892 - The World's Columbian Exposition is dedicated.

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1944 - US troops capture Aachen, first large German city to fall.

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1948 - Facsimile high-speed radio transmission demonstrated (Washington DC).

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1959 - U.S. President Dwight D. Eisenhower signs the executive order transferring Wernher von Braun and other German scientists to NASA.

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1959 - In New York City, the Solomon R. Guggenheim Museum of contemporary art, designed by Frank Lloyd Wright, opens to the public.

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1960 - John Kennedy and Nixon clash in fourth and final presidential debate (New York City).

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1967 - Thousands opposing Vietnam War try to storm the Pentagon.

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