Cold War (1985–1991) reduced some strategic arms unilaterally. Fundamental to the dissolution of the Soviet Union, the Gorbachev policy initiatives of Restructuring ("Perestroika") and Openness ("Glasnost") had ripple effects throughout the Soviet world, including eventually making it impossible to reassert central control over Warsaw Pact member states without resorting to military force. On June 12, 1987, Reagan challenged Gorbachev to go further with his reforms and democratization by tearing down the Berlin Wall. In a speech at the Brandenburg Gate next to the wall, Reagan stated: While the aging communist European leaders kept their states in the grip of "normalization", Gorbachev's reformist policies
The Age of Openness international perspective." While Dikötter does not deny the devastation caused by the Chinese Civil War or the Japanese invasion, he nonetheless argues that the Republican period was a "golden age of openness" in which the country was making substantial progress toward modernity, boldly experimenting with ideas and market reforms, and building vast infrastructure projects. Historian Jonathan Spence wrote that "The Age of Openness" ""presents a cornucopia of graphic examples to show that China in the first half of the twentieth century, far from being in a state of decay that called for revolutionary action, was in fact a vibrant and