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In the mid-20th century, following World War II, nations such as the United States, Canada, and those across Europe experienced baby booms, characterized by high fertility rates. For instance, in the 1950s, American women birthed an average of three to four children. However, by the early 21st century, fertility rates across these nations dropped to alarming lows. The birth rate in the U.S. has now fallen to 1.6, while the UK and Australia stand at 1.5, and countries like Italy and Spain record even lower rates around 1.3. This decline has taken root most severely in countries like South Korea, where the fertility rate has plummeted to an astounding 0.67.