U.S. President Barack 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.

U.S. President Barack Obama (C) 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. [Zhang Jun/Xinhua]

Obama's signature makes the bill, the same as the Senate passed in December, immediately become the law of the land. The House passed the measure in a completely party-line vote of 219 to 212 late Sunday night.

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Before signing the bill, the president made remarks at the White House to an audience of House and Senate Democrats who backed the bill as well as ordinary Americans who had sent letters to Obama telling him their struggles with skyrocketing insurance premiums.

"Today after almost a century of trial, today after over a year of debate, today after all the votes have been tallied, health insurance reform becomes law in the United States of America," said Obama.

"It is fitting that Congress passed this historic legislation this week for as we mark the turning of spring, we also mark a new season in America," he added.