The House of Representatives voted 421-1 to authorize the use of military force against the perpetrators of the September 11th attacks
The Senate voted to acquit former President Trump of charges of inciting the January 6th attack on congress. Although Senate Minority Leader Mitch McConnell expressed that Trump was legally culpable for a "disgraceful dereliction of duty", he concluded that the Senate is unable to convict former officials. The Senate had previously held it has the power to do so.
In 1882, Congress passed the Edmunds Anti-Polygamy Act, which prohibited polygamy and 'unlawful cohabitation'. The Act set off a series of court cases which culminated in the disincorporation of the Church of Jesus Christ of Latter-day Saints.
The 42nd Congress voted 115-65 to establish Yellowstone, America's first national park -- despite concerns surrounding federalism
The Civil Rights Act of 1964 outlawed discrimination based on race, sex, and national origin in employment, accommodation, and education.