(100323) -- WASHINGTON, March 23, 2010 (Xinhua) -- U.S. President Barack Obama signs the healthcare reform bill at the White House in Washington D.C., capital of the United States, March 23, 2010. Obama on Tuesday signed a sweeping healthcare reform bill that passed the House of Representatives on Sunday night, on track to bring the most profound changes to the nation's social security system in more than four decades. (Xinhua/Zhang Jun) (zw) | Location: Washington, China.
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