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The Trans-Amazonian Highway (official designation BR-230, official name Rodovia Transamazônica), was inaugurated on August 30, 1972. It is 5,300 km long, making it the third longest highway in Brazil. It runs through the Brazilian states of Piaui, Maranhão, Tocantins, Pará and Amazonas, from the proximities of Saboeiro up until the town of Lábrea. The highway was intended to integrate these regions with the rest of the country, and with Peru and Ecuador...

The Vietnam War was a Cold War military conflict that occurred in Vietnam, Laos, and Cambodia from November 1, 1955, to April 30, 1975 when Saigon fell. This war followed the First Indochina War and was fought between the communist North Vietnam, supported by its communist allies, and the government of South Vietnam, supported by the United States and other anti-communist nations...