When a countries economy is strong it makes the country powerful, countries with low economy always find themselves borrowing from countries with stronger economy and there by making such country or nation subject to the nation with stronger economy.
Those countries with strong economy controls the world's political and religion system.
In other for a country to grow in all area's, it's major focus should be growing her economy, when this is achieved then that nation will become one of the most powerful nations in the world.
United States, China, Russia and Germany. This aforementioned nation's are seen as the most powerful nations of the world they all have a strong economy, strong economy is the beginning of a powerful nation.
It is true that the countries you mentioned above are the countries with the strongest economies in the world, but the worst thing that strong countries have is that they will always feel that they are right and other countries are wrong. just look at what the USA and China are doing to countries they consider small, indirectly they control those countries, if you are born in a strong country, you will definitely feel a little safer than being born in a country with a weak economy.
currently the countries are at war, each of them is hiding behind strong countries, they want to protect their country from fatal attacks, the strong countries consider them gods, that is a natural thing.