Before Obamacare, according to the Kaiser Family Foundation, more than 44 million Americans lacked health insurance. After the ACA, that number fell to fewer than 26.7 million—a historic low. The percentage of Americans who lacked health insurance had been stuck around 17 percent for years before the ACA. After it was fully implemented, the number dropped dramatically, to around 10 percent. Nearly 20 million Americans have health insurance today because of Obamacare.