(cali, ariz, new mex, tex, okla, ark, louisiana, miss, tenn, va, ga, fla, sc, nc) With so many people on the move, families were being strained, which explained the success of Dr. Benjamin Spock's The Common Sense Book of Baby and Child Care (1945). Immigration also led to the growth of a fifteen-state region in the southern half of the U.S. known as the Sunbelt, which dramatically increased in population. In fact, in the 1950s, California overtook New York as the most populous state. Immigrants came to the Sunbelt for more opportunities, such as in California's electronics industry of the aerospace complexes of Texas and Florida. Federal dollars poured into the Sunbelt (some $125 million), and power grew there as well, as ever since 1964, every U.S. president has come from that region. Sunbelters were redrawing the political map, taking the economic and political power out of the North and Northeast.