What technique had been used by Native Americans for thousands of years and is now used today by agencies such as the U.S. Forest Service to prevent the spread of wildfires?

The technique used by Native Americans for thousands of years and now used by agencies such as the U.S. Forest Service to prevent the spread of wildfires is called prescribed burning. Prescribed burning involves intentionally setting controlled fires in a specific area to reduce the amount of fuel available for a potential wildfire. This technique helps to prevent the spread of wildfires by reducing the amount of dry vegetation and other combustible materials that can fuel a fire. Additionally, prescribed burning can help to promote the growth of certain plant species and improve overall ecosystem health.