Would the USSR do the same to cities in the USA or Canada? This atomic bomb, the equivalent of 20,000 tons of TNT, flattened the city, killing tens of thousands of civilians. On August 6, 1945, the United States had used a massive, atomic weapon against Hiroshima, Japan. There was genuine fear across north America that the possibility of nuclear annihilation existed. The invasion was known as the “Cuban Missile Crisis”. The situation became critical following the failed attempt in 1961 of the United States invasion of Cuba, a new Soviet ally. The most well know of these was the DEW line, situated above the Arctic Circle and extending from Greenland to Alaska. In 1954 a joint operation of the US and Canadian governments established three chains of radar stations across Canada to provide early warning of a nuclear attack from Russia. The result was the establishment of an organization of the Federal Government – Civil Defence Canada (sometimes referred to as EMO or Emergency Measures Organization). CIVIL DEFENCE SIRENS IN MEDICINE HAT Following the Second World War a situation called the Cold War arose, wherein the USSR became an enemy of the western countries, primarily the USA and Canada, even though Russia had apparently been an ally during the war.
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