It is almost impossible to control the population balance in the countries of the world due to ethnic differences economic factors caste differences productive population situation and many other reasons. Let us think about it all the population in each of our countries can never be productive or good. Why would other countries want to take those people? Therefore if population density is a problem in any country then that country has to adopt its own control measures.
Over population is the main problem of the under developed countries because those countries have lack of resources and with high population the government is unable to provide facilities to everyone. Also they do not have enough measures to have a control on the population. As opposed to the developed countries, where an increase in population may not be a big issue as they have more resources too but since they have a better mechanism, they have the population control techniques too.
Here you can find the top 10 most populated countries of the world.
