On Dec. 5, 1952, the Great Smog of London descended on the British capital. The unusually thick fog contained toxic pollutants, lasted five days and was blamed for causing thousands of deaths.

In 1955, the American Federation of Labor and the Congress of Industrial Organizations merged to form the AFL-CIO under its first president, George Meany.

In 1994, Republicans chose Newt Gingrich to be the first GOP speaker of the House in four decades.

In 2019, House Speaker Nancy Pelosi announced that she had asked the relevant House committee chairs to begin drawing up articles of impeachment against President Donald Trump, saying his actions left them “no choice” but to act swiftly. (Trump would be impeached by the House on charges of obstruction and abuse of power, but the Senate voted to acquit in the first of two Trump impeachment trials.)