In an effort to entice Mexico to join [[World War I]] on the side of Germany, it promised that Germany would help Mexico regain land it had previously lost to the United States during the [[Mexican War]] if Mexico would declare war against the United States. | In an effort to entice Mexico to join [[World War I]] on the side of Germany, it promised that Germany would help Mexico regain land it had previously lost to the United States during the [[Mexican War]] if Mexico would declare war against the United States. |