Expo '74, officially known as the International Exposition on the Environment, Spokane 1974, was a world's fair held May 4, 1974, to November 3, 1974, in Spokane, Washington, in the northwest United States. It was the first environmentally themed world's fair and attended by roughly 5.6 million people. The heart of the fair park grounds was located on Canada Island, Havermale Island, and the adjacent south bank of the Spokane River, comprising present-day Riverfront Park, in the center of the city.
With the exception of two pavilions, all of the major buildings were modular structures assembled on the site. The fair had 5.6 million visitors and was considered a success, nearly breaking even, revitalizing the blighted urban core, and pumping an estimated $150 million into the local economy and surrounding region.
In proclaiming itself the first exposition on an environmental theme, Expo '74 distanced itself from the more techno-centric world's fairs of the 1960s.
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