On December 19, 1998, a divided US House of Representatives voted to impeach President Bill Clinton on charges of lying under oath to a federal grand jury and obstructing justice in the Monica Lewinsky affair.

Read the Articles of Impeachment.

On December 19, 1984, the United Kingdom and China signed the Sino-British Joint Declaration, which ceded control of Hong Kong to the government of mainland China in 1997. The treaty also ensured that Hong Kong would retain its capitalist and democratic systems for at least 50 years after the transfer of power.