In Republic in Peril, David C. Hendrickson advances a powerful critique of American policy since the end of the Cold War. America's outsized military spending and global commitments, he shows, undermine rather than uphold international order. They raise rather than reduce the danger of war, imperiling both American security and domestic liberty. An alternative path lies in a new internationalism in tune with the United Nations Charter and the philosophy of republican liberty embraced by America's founders.

The sum of the conventional view-touted by the national security...