What are some factors that might stop populations exponential growth?

Economy - If there isn't a sustainable economy, it won't be able to support many people so instead they are limited.

Weather - If a place is too warm or too cold it can affect the population. The weather may be seen as harsh.

Government - If people are not agreeing with the government and are against, many will leave. They won't be able to withstand it.

Overpopulation - If there is too many people, they may restrict how many babies you can have and how many people can live there. China, a co