The new map displays the potential impact of a large-scale nuclear attack on the United States, with 250 million immediate deaths predicted.

The population is spread out among 3.8 million square miles across 50 states, yet nearly one-third of Americans live in just three states: California, Texas and New York.

The United States population grew by 3.3 million people this year, the highest increase in more than two decades that was primarily driven by immigration, according to data released this week by ...