1783 – The Kingdom of Great Britain signs a peace treaty with France and Spain, officially ending hostilities in the American Revolutionary War (also known as the American War of Independence).
1841 – Hong Kong Island is occupied by the British.
1920 – The American Civil Liberties Union is founded.
1921 – The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty.
1961 Inauguration of John F. Kennedy as President of USA
Supreme Court Chief Justice Earl Warren administers the oath of office to President Kennedy. In his speech President Kennedy urges American citizens to participate in public service and "ask not what your country can do for you--ask what you can do for your country."
1981 – Ronald Reagan's presidency was inaugurated. At age 69, he was the oldest man ever to be inaugurated as U.S. President.
1991 – Sudan's government imposes Islamic law nationwide, worsening the civil war between the country's Muslim north and Christian south.
1931 – David Lee, American physicist, Nobel Prize laureate
20 January Knowledge History - Science, Engineering and Management
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