On February 21, 1848, The Communist Manifesto, written by Karl Marx with the assistance of Friedrich Engels, is published in London by a group of German-born revolutionary socialists known as the Communist League.
The political pamphlet--arguably the most influential in history--proclaimed that "the history of all hitherto existing society is the history of class struggles" and that the inevitable victory of the proletariat, or working class, would put an end to class society forever.
On this day in history, Nazi leader Adolf Hitler violates the Treaty of Versailles and the Locarno Pact by sending German military forces into the Rhineland, a demilitarized zone along the Rhine River in western Germany.
In 1935, Hitler unilaterally canceled the military clauses of the treaty and in March 1936 denounced the Locarno Pact and began remilitarizing of the Rhineland. Two years later, Nazi Germany burst out of its territories, absorbing Austria and portions of Czechoslovakia.
In 1939, Hitler invaded Poland, leading to the outbreak of World War II in Europe.