The birth rate probably went up: Food production improves, New farming technology, Rural families grow their own food, Family size is seen as important, The birth rate probably went down: Family planning , Women have access to careers, People enjoy money-making careers, China's 'One Child Policy', The death rate probably went down: Government pays for health care, Smallpox eradicated, Malaria medication paid for by charities, New medicines and drugs discovered, The death rate probably went up: Natural disaster (flood / drought), Poor diet, Obesity diets (e.g. Big Mac'n'Cheese), Pandemic flu (e.g. Spanish Flu / COVID-19),

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