P1Q2 Compare and Contrast about the submarine warfare

The Zimmermann's telegram was seen by the government in the US. It was a note sent to the German ambassador of Mexico telling them that Germany will help Mexico regain its lost terrorties, Texas, California, and Arizona. This note was used to inspire Mexico to ally with Germany. The Germany thought this could work, because it was the strongest country of Europe.

The graph in History Alive! p286, shows a graph where the export value to the Central Power decreases and the money going to the allied nations increasing. This was because of Submarine Warfare. The Germans sunk a few ships that had Americans on it. The Americans aren't too happy about this, so the started to stop supplying the Central Power. This shows that Submarine warfare was the cause of the decline in trade between the US and the Central Power.