Czar Nicholas II and his wife. After Revolution of 1905 he failed to solve Russia's basic political, economic and social problems, this sparked eruptions. March 1917 the first of two revolutions toppled the Romanov dynasty and started more radical changes.
Bloodiest War in American History: Not the Civil War -- World War Two. Although more American died in the Civil War, more Americans were killed in WW2. It's a pedantic technicality perhaps, but the Civil War was America's deadliest war, World War II its bloodiest.
The Battle of Antietam was the bloodiest day in American military history. On the Union side, casualties included more than 2,100 killed, 9,500 wounded and 750 missing or captured. The Confederate count was more than 1,500 killed, 7,700 wounded and 1,000 missing or captured.