to compete in this century as successfully as we did in the last. That’s why our troop commitment in Afghanistan cannot be open-ended -- because the nation that I’m most interested in building is our own.

Now, let me be clear: None of this will be easy. The struggle against violent extremism will not be finished quickly, and it extends well beyond Afghanistan and Pakistan. It will be an enduring test of our free society, and our leadership in the world. And unlike the great power conflicts and clear lines of division that defined the 20th century, our effort will involve disorderly regions, failed states, diffuse enemies.

So as a result, America will have to show our strength in the way that we end wars and prevent conflict -- not just how we wage wars. We’ll have to be nimble and precise in our use of military power. Where al Qaeda and its allies attempt to establish a foothold -- whether in Somalia or Yemen or elsewhere -- they must be confronted by growing pressure and strong partnerships.

And we can’t count on military might alone. We have to invest in our homeland security, because we can’t capture or kill every violent extremist abroad. We have to improve and better coordinate our intelligence, so that we stay one step ahead of shadowy networks.

We will have to take away the tools of mass destruction. And that’s why I’ve made it a central pillar of my foreign policy to secure loose nuclear materials from terrorists, to stop the spread of nuclear weapons, and to pursue the goal of a world without them -- because every nation must understand that true security will never come from an endless race for ever more destructive weapons; true security will come for those who reject them.

We’ll have to use diplomacy, because no one nation can meet the challenges of an interconnected world acting alone. I’ve spent this year renewing our alliances and forging new partnerships. And we have forged a new beginning between America and the Muslim world -- one that recognizes our mutual interest in breaking a cycle of conflict, and that promises a future in which those who kill innocents are isolated by those who stand up for peace and prosperity and human dignity.

And finally, we must draw on the strength of our values -- for the challenges that we face may have changed, but the things that we believe in must not. That’s why we must promote our values by living them at home -- which is why I have prohibited torture and will close the prison at Guantanamo Bay. And we must make it clear to every man, woman and child around the world who lives under the dark cloud of tyranny that America will speak out on behalf of their human rights, and tend to the light of freedom and justice and opportunity and respect for the dignity of all peoples. That is who we are. That is the source, the moral source, of America’s authority.

Since the days of Franklin Roosevelt, and the service and sacrifice of our grandparents

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