The world is a vast place, but have you ever wondered why there are such high concentrations of people in some countries and not others?
China and India are the two most heavily-populated countries in the world. Together, both countries are home to more than 2.7 billion individuals. For reference, there are just 7.4 billion people in the world, yet there are over 190 countries around the world.
Many reasons exist as to why these countries have higher population densities than others, but perhaps some of the most important are the ideal farmlands and the domestic animal stocks. These two circumstances allow the nations to support larger populations than other parts of the world.
Another factor: these countries have fostered higher populations than other areas of the world from the beginning, so they had a bit of a head start. With more people available to reproduce than in other parts of the world from the beginning, exponential growth was naturally higher in these places than anywhere else.
There are other factors to take into consideration, but these appear to be some of the most notable. Regardless of what populations are at today, these numbers will continue to climb as the years go on, but China and India are likely to remain at the top of the population density tree.