The United States, the third most populous country globally, accounts for about 4.6% of the world's population. Within the next few years, the U.S. population -- currently estimated at 299 million persons -- is expected to reach twice its 1950 level of 152 million. More than just doubling in size, the population has become qualitatively different from what it was in 1950. As noted by the Population Reference Bureau, "The ...
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