As the United States prepares to celebrate its 250th anniversary on July 4, an extreme heat wave is affecting many eastern states, raising health concerns during the holiday weekend. Major events include the Great American State Fair in Washington, D.C., and festivities in cities like Philadelphia, Los Angeles, and New York. However, the heat has already led to event cancellations and disruptions, including a parade in Philadelphia and delays in Amtrak services due to temperature-related issues.
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