What top tier countries?
The US is the wealthiest country in the world by miles. It's had the highest GDP every single year for over 100 years continuously.
That amount of capital is phenomenal, and part of why Americans enjoy salaries 3-4x higher than even Western Europe in most professional work - Tech, Medicine, Law, truck driving, etc.
And that money allows you to work your way up, and buy your own property, etc. which is almost impossible in much of Europe, Canada, etc.