"Although Americans today are increasingly skeptical of foreign engagement and global responsibilities, it is a mistake to view those responsibilities as a burden or as charity. Let us remember that the biggest beneficiaries of American leadership and engagement in the world are the American people," Hagel said in an address to the Axelrod's Institute of Politics at the University of Chicago.
"Walking away from the world, and our relationships, is not an option for the United States of America," he said.
"The rise of Asia, the explosion of youth populations in the Middle East and Africa, new technologies bringing people closer together and new threats emanating from these technologies like cyber, deepening global economic interdependence and the diffusion of global economic power, a resurgence of nationalism and sectarian conflict around the world, new sources of energy in this hemisphere and elsewhere, climate change and more frequent and destructive natural disasters - all these realities are challenging and will continue to challenge America's security and prosperity," he said.
Observing that working with allies and friends, American leadership must respond to these challenges and help shape the forces that will shape the future, Hagel said the US must lead with a robust and comprehensive use of instruments of power, employing cultural, educational, economic, diplomatic, development, and military tools alike.
