WASHINGTON (AP) - President Barack Obama says the death of Libya's Moammar Gadhafi and the end of the Iraq war are powerful reminders of America's renewed leadership in the world.

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At the same time, Obama said Saturday that the U.S. now must tackle its "greatest challenge as a nation" - rebuilding a weak economy and creating jobs - with the "same urgency and unity that our troops brought to their fight."

Obama informed the nation on Friday that the long and costly war in Iraq will be over by the end of the year and that some 40,000 U.S. servicemen and women still there "will definitely be home for the holidays."

A day earlier, he hailed the killing of Libya's longtime leader as a "momentous day" in the history of a country that Gadhafi had ruled for decades through tyranny.

Obama said in his weekly radio and Internet address that these foreign policy successes were part of a larger story.

"This week, we had two powerful reminders of how we've renewed American leadership in the world," Obama said. "After a decade of war, we're turning the page and moving forward, with strength and confidence."

He said withdrawing troops from Iraq has allowed the U.S. to focus on Afghanistan and score major victories against al-Qaida, including the killing in May of terrorist mastermind Osama bin Laden. Troops also have been coming home from Afghanistan.