A dangerous heat wave has disrupted July Fourth events across the United States, including Donald Trump's flagship Great American State Fair, as the nation prepares to mark its 250th birthday.

The nation is gripped in a dangerous heat dome. Threatening millions of people in the Midwest and Eastern United States.

Multiday warnings of extreme heat have landed in New York, Boston and Philadelphia. The sultry weather has pushed east just ahead of weekend Fourth of July events in a region that…

High humidity is expected to make conditions feel even hotter