SACRAMENTO — For nearly 20 years, Maria would call her sister — a nurse in Mexico — for advice on how to manage her asthma and control her husband’s diabetes instead of going to the doctor in California. She didn’t have legal status, so she couldn’t get health insurance and skipped routine exams, relying instead on home remedies and, at times, getting inhalers from Mexico. She insisted on using only her first name for fear of deportation. Things changed for Maria and many others in recent years when some Democratic-led states opened up their health insurance programs to low-income immigrants...