1914 would be the storm has arrived (WWI) - WWI started as a simple conflict that became global. So it would mirror the conflict in the US and expands to get the world involved. "If the US falls, the whole world falls" = "If the US succeeds in this mission, the whole world will succeed".
Adding notes to this.
1914 would be the storm has arrived (WWI) - WWI started as a simple conflict that became global. So it would mirror the conflict in the US and expands to get the world involved. "If the US falls, the whole world falls" = "If the US succeeds in this mission, the whole world will succeed".