The United States, the world's largest economy, is facing a severe demographic challenge. In the second half of the 20th century, the annual growth rate of the working age population (aged 15-64) in the United States was 1.3%. However, as the century began, the annual growth rate dropped to 1.1%. What is even more surprising is that in the 2010s, the population growth rate of the United States rapidly slowed down, and according to the United Nations Population Di ...
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