Why did president Wilson begin to support the idea of war preparedness?

President Wilson began to support the idea of war preparedness due to increasing global tensions and threats to American interests, particularly from Germany's unrestricted submarine warfare and its attempts to influence Mexico against the U.S. The sinking of ships like the Lusitania and the interception of the Zimmermann Telegram heightened public and political pressure for a stronger military stance. Wilson recognized that a prepared military would bolster diplomatic efforts and protect national security, leading him to advocate for increased defense spending and military readiness.