documentary (Contrast & compare Submarine Warfare, The Zimmerman Telegram and the graph)

In the graph, the U.S was selling weapons and military equipments to the allied a lot. However, they sold those things to Central force so few, comparing with the allied. Day by day, the margin was getting bigger. On that period, The Zimmerman Telegram happened.

We can speculate that the damage of America by Germany submarine warfare might affected that to turn the America’s mind toward the allied. And the Zimmerman Telegram could justify their purpose of getting into War, standing for the Allied.