A severe heatwave is sweeping across the United States, causing the cancellation of numerous Fourth of July events, including the Washington D.C. parade and Philadelphia's Salute to Independence Semiquincentennial Parade. The National Weather Service reported that more than 165 million people were experiencing record-breaking temperatures along the East Coast and Midwest on Friday. This heatwave is posing significant challenges during the holiday weekend, particularly as U.S. President Donald Trump hosts a celebration marking America's 250th birthday, and multiple World Cup matches take place outdoors. The intense heat has also led to temporary closures and treatment of heat-related illnesses at events such as the Great American State Fair in Washington D.C. and the fair on the National Mall. Despite the predicted high temperatures, Trump plans to speak outside during a celebration on Saturday. The heatwave is expected to continue through the weekend, with Philadelphia and Washington D.C. approaching their all-time record highs. This comes after an unprecedented early summer heatwave across Europe. As a result of these conditions, safety precautions are being encouraged for those planning outdoor activities during this potentially dangerous period.