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Demographic history is the reconstructed record of human population in the past. Given the lack of population records prior to the 1950s, there are many gaps in our record of demographic history. Given the lack of population records prior to the 1950s, there are many gaps in our record of demographic history.
The Indigenous population of the Americas in 1492 was not necessarily at a high point and may actually have already been in decline in some areas. Indigenous populations in most areas of the Americas reached a low point by the early 20th century. [20]
A recent UN report states that the “world’s population is expected to continue growing for another 50 or 60 years, reaching a peak of around 10.3 billion people in the mid-2080s, up from 8.2 ...
The average age at first marriage for both men and women began to fall after WWII, dropping 22.8 for men and 20.3 for women in 1950 and dropping even more to 22.5 and 20.1 years in 1956. In 1959, the United States Census Bureau estimated that 47% of all brides marrying for their first time were teenagers aged 19 and under.
Based on this, the UN projected that the world population, 8 billion as of 2023, would peak around the year 2086 at about 10.4 billion, and then start a slow decline, assuming a continuing decrease in the global average fertility rate from 2.5 births per woman during the 2015–2020 period to 1.8 by the year 2100 (the medium-variant projection).
The population of early humans dwindled to around 1,280 individuals during a time of dramatic climate change and remained that small for about 117,000 years, the study said.
At next count, in 1965, the population had plummeted and only 42 reindeer were left alive. Thomas Malthus (1766-1864) is perhaps the most well-known writer to have articulated the roots of the modern concept of human overshoot, with The Population Bomb (1967) by Paul Ehrlich reigniting the hotly-debated topic in more recent history.
But, over the past 130 years, the indigenous population has recovered and now makes up 45% of the 7,800 inhabitants of the island, also known as Rapa Nui – and part of Chile since 1888.