Biden Says U.S. Must Lead the World, Warns of Power Vacuum if America Steps Back President Joe Biden argued that the United States has a responsibility to lead the free world, saying American leadership is essential to global stability. In brief remarks, Biden questioned who would fill the void if the U.S. stepped aside, pointing to Russia and China as potential alternatives. He said leadership is owed not only to Americans and their families, but to the world, emphasising that the U.S. can get