How many people lived on earth between 1900 and 1950?

Between 1900 and 1950, the global population experienced significant growth, increasing from approximately 1.6 billion in 1900 to about 2.5 billion by 1950. This period saw improvements in healthcare, agriculture, and living conditions, contributing to higher birth rates and declining mortality rates. The population growth was also influenced by events such as World War I and World War II, which had varying impacts on population dynamics in different regions.