During the Second Industrial Revolution, steel became one of the most important building materials in the world.
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In 1939, the British government circulated a pamphlet about how to care for ... I. In April 1916, Germany implemented the world's first clock shift as part of a plan to ... Daylight saving was widely regarded as a wartime measure
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China became more diverse as it was introduced to Buddhism and Daoism, and created new religions such as Zen Buddhism and Neo-Confucianism.
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The crusades lasted from around 1096 to about 1291, making the answer early 200 years.