The sinking or Lusitania on 7 May 1915 was a significant event during WW1. It was a passenger liner sunk by German submarine during World War 1. It lead to America declaring war on Germany.
Communist party leader needed to retreat
France helped provide troops, money and military leadership to the Americans. They made a treaty of alliance which means they were allies against Great Britain.
Answer: I would have to say the first one. Because saying that I live in Nevada, I know that they had to build to the Rocky Mountains, and the Sierra Nevada's.