twentieth-century

The opening of the border crossings between East and West Berlin on November 9, 1989, marking the symbolic end of the Cold War.

A pair of revolutions in Russia in 1917 that dismantled the Tsarist autocracy and led to the rise of the Soviet Union.

A global conflict spanning from 1939 to 1945 that involved the vast majority of the world's countries, organized into the opposing Allies and Axis alliances.