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1912, marked one of the deadliest maritime disasters in history.

1914, event that precipitated World War I.

1917, led to the overthrow of the Tsarist regime; rise of Soviet power.

1919, ended World War I and laid the groundwork for World War II.

1930s, severe worldwide economic depression that took a toll on European economies.

1933, Hitler becomes Chancellor of Germany, beginning of the Third Reich.

1936-1939, conflict between Republicans and Nationalists; precursor to WWII.

1938, anti-Jewish pogroms in Nazi Germany.

1939, invasion of Poland by Germany; major global conflict begins.

1944, Allied forces invade German-occupied France.

1945, unconditional surrender of Nazi Germany.

1949, establishment of the North Atlantic Treaty Organization.

1956, revolt against the Soviet-imposed policies in Hungary.

1961, barrier erected by East Germany, symbol of the Cold War.

1968, period of political liberalization in Czechoslovakia under Alexander Dubček.

1989, symbol of the end of the Cold War.

1986, catastrophic nuclear accident in the Soviet Union.

1990s, dissolution of Yugoslavia into independent states.

1991, final collapse of the Soviet regime, end of the Cold War era.

1992, treaty established the European Union.

1998, agreement helped to end most of the violence in Northern Ireland.

1990, unification of West Germany and East Germany into a single Germany.

1957, the first artificial satellite to be put into Earth's orbit by the Soviet Union.

1962, 13-day confrontation between the United States and the Soviet Union over Soviet ballistic missiles in Cuba.

1980s, the first trade union in a Warsaw Pact country that was not controlled by the Communist Party.

1969, the first humans landed on the Moon (American astronauts).

1982, a ten-week war between Argentina and the United Kingdom over two British overseas territories in the South Atlantic.