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Top of the IA Hierarchies

			............ Named Events
			................ <Global historical events>
			.................... AIDS pandemic (global event, from late 20th century)
			.................... Cold War (global event, 1947-1991)
			.................... Great Depression (global economic event, 1929-1939)
			.................... Industrial revolution (global event, from 18th century)
			.................... Little Ice Age (natural event, ca. 1400 and 1700 CE)
			.................... Medieval Climate Anomaly (natural event, ca. 950-1250 CE)
			.................... Vietnam War (Asian-Western event, 1954-1975))
			.................... World War I (global war, 1914-1918)
			.................... World War II (global war, 1939-1945)