I am not saying the Japanese did not deserve to get bombed in WW2. They were an aggressor nation back then and as for the atomic bombs, they asked for it IMO.

It is true that other developed countries like the USA, New Zealand and Australia ( especially Australia ) have done much better economically than Japan over the past 20 years.

I don't think this is due to high immigration rates in the Western countries though.

The Australian businessman and philanthropist Dick Smith ( a smart man and not racist at all ) has raised his fears about high population growth several times and made a few documentaries about it.

More immigrants does not solve economic problems. It is a "giant Ponzi scheme" as Smith said. New immigrants also eventually get old and are a further burden on already maxed out social security and health systems.

Often, these migrants will be under-employed or unemployed. Unemployment among many African and Middle Eastern migrants in Sydney for example is very high. The "extra taxes" idea is a red herring.

More people means more freeways, more traffic, more housing ( a huge problem in some Western cities ) more rubbish, more urban sprawl and shopping malls. What about energy and water supply and security?

Dick Smith said that Australia's population should level out at around about 25 to 26 million people as this is mostly an arid country with already very large cities on the east coast.

In the USA you are different, your population is fairly evenly spread out with a much smaller percentage of the population living in the major cities. Still, by most measures, your country is also overpopulated.

It is interesting that the countries with smaller populations or lower population density seem to have the best standards of living. Ireland, New Zealand, Finland, Norway, etc. Maybe the USA, UK, Australia, we can learn from them?