History of Germany (1945–90) on 13 February 1990. The six foreign ministers met four times in the ensuing months in Bonn (5 May), Berlin (22 June), Paris (17 July), and Moscow (12 September). The Polish Foreign Minister participated in the part of the Paris meeting that dealt with the Polish-German borders. Overcoming Soviet objections to a united Germany's membership in NATO was of key importance. This was accomplished in July when the alliance, led by President George H.W. Bush, issued the London Declaration on a transformed NATO. On 16 July, President Gorbachev and Chancellor Kohl announced the agreement in principle on a united Germany
Chancellor of Germany DDR)". (See Leaders of East Germany.) The head of the federal government of the North German Confederation, which was created on 1 July 1867, had the title "Bundeskanzler". The only person to hold the office was Otto von Bismarck, the prime minister of Prussia. The king, being the bearer of the "Bundespräsidium", installed him on 14 July. Under the constitution of 1 January 1871, the king had additionally the title of Emperor. The constitution still called the chancellor "Bundeskanzler". This was only changed in the new constitution of 16 April 1871 to "Reichskanzler". The office remained the same, and Bismarck