The utter failure of Paul Ryan, Mitch McConnell, and Donald Trump to pass a bill rolling back the Affordable Care Act makes one thing perfectly clear: love him or hate him, Barack Obama is one of the most consequential presidents in American history — and that he will be a particularly towering figure in the history of American progressivism.

He signed into law a comprehensive national health insurance bill, a goal that had eluded progressive presidents for a century — and built it strong enough to withstand assaults from the Supreme Court and avoid repeal from a Republican administration. He got surprisingly tough reforms to Wall Street passed as well, not to mention a stimulus package that both blunted the recession and transformed education and energy policy.

He's put in place the toughest climate rules in American history and signed a major international climate accord. He opened the US to Cuba for the first time in more than half a century, and reached a peaceful settlement to the nuclear standoff with Iran.
https://www.vox.com/platform/amp/2015/6/26/8849925/obama-obamacare-history-presidents