Want to know how many people in the U.S. don’t have health insurance? The population of our 44 largest cities – combined. Can you see, now, how health care becomes a critical national security issue? We’re talking the population of the top 45 cities in the United States, all who can’t get health care. Imagine (worst case scenario) that all those cities shut down. America, as a civilization, would come to a screaming halt.