Grants Pass- U.S. Forest Service Chief Dale Bosworth said thinning national forests and restoring the natural role of fire in the ecosystem should be made top priority after he toured the largest active wildfire in the nation.The Florence Fire was threatening to become the largest wildfire in state history after expanding to 308,000 acres on the Siskiyou National Forest and adjoining lands in southwestern Oregon and Northern California.The largest wildfire in Oregon was the Tillamook Fire in 1933 which burned 311,000 in the northwest corner of the state.The threat to 17,000 people of the Illinois Valley has eased, but the...