20th century 20th century The 20th (twentieth) century was a century that began on January 1, 1901 and ended on December 31, 2000. It was the tenth and final century of the 2nd millennium. It is distinct from the century known as the 1900s which began on January 1, 1900 and ended on December 31, 1999. The 20th century was dominated by a chain of events that heralded significant changes in world history as to redefine the era: flu pandemic, World War I and World War II, nuclear power and space exploration, nationalism and decolonization, the Cold War and post-Cold War conflicts;
Christianity in the 20th century protested against deportation of Jews in the Netherlands, the Nazis responded with even more severe measures. Neo-orthodoxy is a branch of Protestant thought arose in the early 20th century in the context of the rise of the Third Reich in Germany and the accompanying political and ecclesiastical destabilization of Europe in the years before and during World War II. Neo-orthodoxy's highly contextual, dialectical modes of argument and reasoning often rendered its main premises incomprehensible to American thinkers and clergy, and it was frequently either dismissed out of hand as unrealistic or cast into the reigning left- or right-wing molds of