The population of the USA, as 5% of the world's population, consumes 30 % of the worlds resources. The USA at the present time must borrow over $150 billion a year externally to finance a 15 year long binge of household, social and defence spending. The USA has become the largest debtor in the world from the largest creditor in the last two decades.
According to the Vatican, the real problem is not overpopulation, but overconsumption.
Societies that consume more goods and services than they produce or can purchase from which they produce are morally and financially in difficulty.