Climatic condition was the major factor for migrating to new places.
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Mikhail Sergeyevich Gorbachev[e] (born 2 March 1931) is a Russian and former Soviet politician. The eighth and last leader of the Soviet Union, he was the General Secretary of the Communist Party of the Soviet Union from 1985 until 1991. He was also the country's head of state from 1988 until 1991, serving as the chairman of the Presidium of the Supreme Soviet from 1988 to 1989, chairman of the Supreme Soviet from 1989 to 1990, and president of the Soviet Union from 1990 to 1991. Ideologically, Gorbachev initially adhered to Marxism–Leninism, although he had moved towards social democracy by the early 1990s.
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Augustus reorganized Roman life throughout the empire. He passed laws to encourage marital stability and renew religious practices. He instituted a system of taxation and a census while also expanding the network of Roman roads