How and why did NATO, a Cold War military alliance created in 1949 to counter Stalin's USSR, become the cornerstone of new security order for post-Cold War Europe? Why, instead of retreating from Europe after communism's collapse, did the U.S. launch the greatest expansion of the American commitment to the old continent in decades? Written by a high-level insider, Opening NATO's Door provides a definitive account of the ideas, politics, and diplomacy...