Before World War One broke out, alliances were made to keep the peace in Europe, stopping any one nation from becoming too powerful. Two military alliances emerged a few years before the war: ...

During World War II, an exasperated Winston Churchill observed that “there is only one thing worse than fighting with allies, and that is fighting without them.” ...

One for all, all for one: first World War Allies agree military strategy. The deadly battles of Verdun, the Somme, and Salonika were fought in solidarity by the Allies to take pressure off each other.

With tensions rising in the Indo-Pacific, Beijing’s new triumphalism takes aim at one-time ally U.S., while Washington and its regional partners embrace former foe Japan’s historical revisionism.

After World War I, Hitler identified the natural affinity of the Anglo-Americans as Germany’s greatest threat. That common language came to serve the cause of freedom well. Yet both sides couldn ...

Steve Inskeep: There has been this world order, particularly in Europe, ever since World War II. The U.S. leads its European allies when necessary against Russia. That was the form in the early ...