Although wildfires in the American West dominate headlines, the single most destructive fire in U.S. history could occur in the Northeast. New Jersey's Pinelands (also known as the Pine Barrens) is the lone island of contiguous forest in the 45-million-person megacity that comprises the Eastern Seaboard from Richmond, Virginia, to Boston — the densest population cluster in the country. Whereas regular fires used to thin out the Pinelands, large swaths have remained relatively untouched for decades due to strict preservation laws. The result is a giant tinderbox of untended woods that's surrounded by 100,000-person suburbs. A Wildfire Risk Assessment published by New Jersey compared the Pinelands to "an inch of gasoline covering all of south and central New Jersey." ... In wildland firefighting, success does not breed success. Stopping fires in their infancy allows forests to grow thicker and more at risk of bad blazes. Before the Forest Service started fighting fires, around 1910, lightning strikes and native peoples used to burn around 50 million Western acres each year. Today, some 30,000 wildland firefighters and their equipment — smokejumpers, fire engines, air tankers — check that number at around 11 million. If that sounds impressive, it's worth noting that 50 years ago about a third as many firefighters kept the annual acreage burned to roughly half what it is today. The flames have become that much harder to control.