<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwoA" rel="mw:WikiLink" title="World War I">World War I</a>: The <a href="https://en.wikipedia.org/wiki/American_Expeditionary_Forces" id="mwoQ" rel="mw:WikiLink" title="American Expeditionary Forces">American Expeditionary Forces</a> begin to arrive in France. They will first enter combat in the Battle of Hamel on the 4th of July.