You can look at height to determine which ones are failed civilizations.

One of the most prominent sexual selection traits that cannot be faked is height.

In the majority of cases women are attracted to taller men.

https://worldpopulationreview.com/country-rankings/average-height-by-country

The bottom 10% of nation states are below 5ft 6 inches.

These nation states have no future.

If your height is above 5 ft 6 inches you have a chance.

If you are below 5ft 6 inches you need to be in the top 10% of whatever field you are in to get anywhere.

If your country's average height is less than 5 ft 10 inches your army cannot win wars against the west.

The western world has the majority of tall populations in the world which is how we know that they will keep growing in numbers over time.

Mexico is not a real country, it's average male height is 5ft 7 inches.

Japan has no future. Their average male height is 5ft 8 inches.

China is going to get stuck in the middle income trap, as its population average male height is 5ft 9 inches.

You must be this tall (5 ft 10 inches) to be part of the future.