With four years of peace and progressive reform and a booming economy (due to the strong French and UK wartime demand for US imports), you would think Woodrow Wilson would cruise to an easy re-election. You would be wrong.

In the wake of Pancho Villa's attack on the town of Columbus, New Mexico, the US Army sends an expeditionary force into Mexico in pursuit of Villa and his fighters, commanded by Gen. John "Black Jack" Pershing.

German East Africa was the last holdout among German colonial possessions. Neighboring Portuguese and Belgian soldiers, as well as South Africans, joined in to help the British, although the British were not always happy to accept their assistance.