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 Gettysburg in 1863 was the bloodiest battle fought on American soil. In three days 5,662 soldiers were confirmed killed, 10,584 were missing, and 27,203 were wounded. As mentioned, the Civil War was the bloodiest for Americans. More Americans died in that war than in all of its other wars combined.