If we reached 1 billion people on earth not that long ago, why people didn't make as much kids as now ?
The world's population has increased dramatically over the past few centuries, from around 1 billion people in 1800 to over 7 billion people today. The reasons for this growth are complex and multifaceted, and can be attributed to a variety of factors including advances in medicine, improved sanitation and hygiene, and increases in food production and distribution.

However, it's important to note that the rate of population growth has not been consistent over time, and has been influenced by a variety of social, economic, and cultural factors. In general, as societies become more developed and prosperous, fertility rates tend to decline, as people have fewer children and invest more resources in each child's upbringing.

In the past, when resources were scarce and mortality rates were high, it was common for people to have larger families to ensure that at least some of their children would survive to adulthood and be able to support the family. However, as living conditions improved and infant mortality rates decreased, there was less need for large families, and birth rates began to decline.

Additionally, social and cultural changes have also played a role in declining fertility rates. For example, as women have gained more opportunities for education and employment, they have often chosen to delay or forego having children in order to pursue other goals. Moreover, the widespread availability of contraception and family planning services has made it easier for people to control their reproductive choices and have smaller families if they so choose.

In summary, while population growth has been influenced by a variety of factors over time, including advances in medicine and increases in food production, declining fertility rates as societies become more developed and prosperous have played a major role in slowing population growth in recent decades.
What long term changes in society will the widespread availability in contraception cause? As well as women gaining more opportunities for education and unemployment? If those people don't reproduce, won't the surviving people be the ones that don't seek education and employment, and the ones that don't use contraception?