The world population has shown a continuous growth trend since 1800, with population growth accelerating significantly towards the end of the 19th century and the beginning of the 20th century. The Industrial Revolution in the late 19th century and the economic development it brought improved living conditions in most countries globally, leading to accelerated population growth. From the mid-20th century, developing countries such as China and India experienced rapid population growth. In contrast, high-income countries saw a gradual slowdown in population growth rates after entering the 20th century.