<a href="https://en.wikipedia.org/wiki/World_War_I" id="mw3g" rel="mw:WikiLink" title="World War I">World War I</a>: The U.S. ambassador <a href="https://en.wikipedia.org/wiki/Walter_Hines_Page" id="mw3w" rel="mw:WikiLink" title="Walter Hines Page">Walter Hines Page</a> to the United Kingdom is given the <a href="https://en.wikipedia.org/wiki/Zimmermann_Telegram" id="mw4A" rel="mw:WikiLink" title="Zimmermann Telegram">Zimmermann Telegram</a>, in which Germany pledges to ensure the return of <a href="https://en.wikipedia.org/wiki/New_Mexico" id="mw4Q" rel="mw:WikiLink" title="New Mexico">New Mexico</a>, <a href="https://en.wikipedia.org/wiki/Texas" id="mw4g" rel="mw:WikiLink" title="Texas">Texas</a>, and <a href="https://en.wikipedia.org/wiki/Arizona" id="mw4w" rel="mw:WikiLink" title="Arizona">Arizona</a> to Mexico if Mexico declares war on the United States.