10 Most Populated Countries in 2100

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6. United States of America 

Projected Population in 2100: 393 million 

The USA’s population in 2023 is 339 million and is projected to increase to 390 million by 2050. Subsequently, the growth is expected to stabilize, reaching 393 million by 2100. While the USA’s fertility rate is relatively low, immigration significantly contributes to its population growth.

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