WASHINGTON (AP) — Turning the page on years of war and recession, President Barack Obama summoned a divided nation Monday to act with "passion and dedication" to broaden equality and prosperity at home, nurture democracy around the world and combat global warming as he embarked on a second term before a vast and cheering crowd that spilled down the historic National Mall.

"America's possibilities are limitless, for we possess all the qualities that this world without boundaries demands," the 44th president declared in a second inaugural address that broke new ground by assigning gay rights a prominent place in the wider struggle for equality for all.

In a unity plea to politicians and the nation at large, he called for "collective action" to confront challenges and said, "Progress does not compel us to settle centuries-long debates about the role of government for all time — but it does require us to act in our time."