A study from Yale argues that population increases are directly related to globalized food distribution, increased access to drinkable water, improvements in public health and medical advancements, but higher levels of poverty, illiteracy and religiosity also correlate with population growth.
Ultimately, if there are more births than deaths, and emmigrations than immigrations, then a population will increase, but beyond that, it does depend on available health and resources.
In the early 1800 thier was a suddenn growth because the world realized they had many natural resources so they start using it especially for medicine, so this made it much more easier to give birth than before. This was called industrial growth.
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