Wars Without Declarations

The President sends U.S. military forces into an area where they come under enemy fire. Congressmen denounce him for dragging the nation into battle "unconstitutionally." But it is too late; war has begun, and Congress has no choice except to let it continue.

A description of how the U.S. got into war in Viet Nam in 1965? Or how it might become embroiled in the Persian Gulf conflict the day after tomorrow? Not quite: this war began in 1846, when President James K. Polk sent troops to occupy a disputed border area between Mexico and the new state of Texas, touching...