Final answer:
President Obama's passage of the Affordable Care Act in 2010 marked the first major healthcare legislation since President Lyndon B. Johnson's Medicare in 1965. Prior attempts by other presidents, including Bill Clinton, were unsuccessful.
Step-by-step explanation:
President Barack Obama was able to get through Congress his plan for a national health care system in 2010, known as the Affordable Care Act or Obamacare. This was the first time since 1965 that major healthcare legislation had been introduced since President Lyndon B. Johnson, who secured the passage of Medicare. Before Obama, other presidents, including Bill Clinton, attempted healthcare reform but were unable to get their proposals passed through Congress.