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.
I believe the original poster may have mis-remembered the TV documentary statement. I've often heard/read it claimed that the American Civil War was the bloodiest war in U.S. history, but I've never seen it claimed that it was the bloodiest civil war (ever) in history. However, even the claim that it's the bloodiest war in U.S. history is debatable. The figures usually quoted for American Civil War casualties are a sum of U.S. and C.S. casualties. By that type of measure (U.S. + enemy casualties) quite a few wars in which the U.S. has since participated were bloodier.