The November 1989 fall of the Berlin Wall ushered in myriad discussions about German reunification. In addition to questions about the domestic future of Germany, concerns over who would be responsible for Germany’s security and stability and with whom the new German state would ally persisted. Marc Trachtenberg revisits the February 1990 meeting wherein United States Secretary of State James Baker assured the Soviet Union that the U.S. would not support NATO’s eastward expansion if Soviet leader Mikhail Gorbachev would accept its presence in a newly reunified Germany. While both the Soviet Union and the United States expressed an understanding of the consequences of leaving Germany to unilaterally reestablish its own security, Baker’s statement was remarkable. Perhaps even more remarkable, though, was the Soviet Union’s willingness to accept this condition knowing that it would likely alter the global balance of power, at least in the short term. Thirty years later, Germany remains a successful example of reunification as a democratic state reintegrated into the international system. A key exception from what was envisioned in that February meeting, however, is that in the same thirty-year period NATO grew from sixteen to thirty member states – it expanded significantly further than Baker’s “one inch” east promise. The United States’ ultimate decision to support and advocate in favor of NATO expansion post-Cold War was met with Russian condemnation which persists to this day.