In History, Today on January 21

The Swiss Anabaptist Movement is born when Conrad Grebel, Felix Manz, George Blaurock, and others baptize each other in the home of Manz's mother in Zürich, breaking a thousand-year tradition of church-state union.

King Louis XVI of France was executed by guillotine in Paris, marking a pivotal moment in the French Revolution.

The first Monte Carlo Rally took place, establishing a tradition in motorsport.

Vladimir Lenin, the leader of the Bolshevik Revolution and the first head of the Soviet state, died, leading to a power struggle in the Soviet Union.

The USS Nautilus, the world's first operational nuclear-powered submarine, was launched in Groton, Connecticut.

The Concorde supersonic passenger jet began commercial service with flights from London to Bahrain and Paris to Rio de Janeiro.

The stock markets around the world experienced a significant decline, known as 'Black Monday', due to fears of a U.S. recession.

The U.S. Supreme Court delivered its decision in Citizens United v. Federal Election Commission, allowing corporations and unions to spend unlimited amounts on political campaigns.

The Women's March took place in Washington, D.C., and around the world, with millions of people protesting for women's rights and other civil rights issues.

A total lunar eclipse, also known as a 'super blood wolf moon', was visible across North and South America, Europe, and Africa.

The United States rejoined the Paris Agreement on climate change, reversing the previous administration's withdrawal from the international accord.