Berlin Wall was a deep anxiety over prospects for a reunified Germany. In September 1989, British Prime Minister Margaret Thatcher pleaded with Soviet President Mikhail Gorbachev not to let the Berlin Wall fall and confided that she wanted the Soviet leader to do what he could to stop it. After the fall of the Berlin Wall, French President François Mitterrand warned Thatcher that a unified Germany could make more ground than Adolf Hitler ever had and that Europe would have to bear the consequences. On 21 November 1989, Crosby, Stills & Nash performed the song "Chippin' Away" from Graham Nash's 1986 solo
Berlin Wall Day. On 9 November 2009, Berlin celebrated the 20th Anniversary of the Fall of the Berlin Wall with a "Festival of Freedom" with dignitaries from around the world in attendance for an evening celebration around the Brandenburg Gate. A high point was when over 1,000 colourfully designed foam domino tiles, each over tall, that were stacked along the former route of the Wall in the city center were toppled in stages, converging in front of the Brandenburg Gate. A Berlin Twitter Wall was set up to allow Twitter users to post messages commemorating the 20th anniversary. The Chinese government quickly