Geography - Population and resources case studies

Singapore did a '3 or more scheme' and gave people extra money and incentives for having 3 or more children when their population was low. China obviously had the famous one child policy as they became overpopulated, in Mumbai there are 1 million people in the slum of Dharavi. Hope this helps.

You have many options, the most popular is usually china, india, bangladesh, indonesia there are may case studies for overpopulation

under population - most european countries are good examples - i would pick romania as a good example of country with a population crisis.