Tammy Baldwin (D-WI) became the first openly LGBT senator in 2012.
Visualize the 117th House and its members, and compare it with past congresses
On December 19th, 1998, the House of Representatives passed House Resolution 611, referred President Bill Clinton to the Senate for impeachment prosecution on charges of perjury and obstruction of justice
In 1866, the House voted 105-20 to try former Confederate President Jefferson Davis for treason -- the trial ultimately never occurred.
Under the direction of President John Adams, the Congress passed the Sedition Act of 1798, which made it a criminal offence to publish statements critical of the federal government. The first individual to be tried under the law was Rep. Matthew Lyon, who unsurprisingly had voted against its passage. Lyon was re-elected from jail.