This is simply, objectively, not true.
>Certain nations, like the US, don't have to work with anyone. We are one of the few nations who have enough resources ( including oil ) to keep our civilization running.
Doesn't the US import almost double what it exports (https://www.eia.gov/tools/faqs/faq.php?id=727&t=6)? Also, why has the US worked so hard in the past 70 years to maintain influence across the world, warring and pillaging and murdering, and trading and bribing as well? Doesn't their standard of living rest on the global state of affairs they strive to maintain (or further exploit)?
>The post ww2 era is an anomaly in human history where one nation ruled the world.
In terms of technology, the last 100 years have been more transformative than the 10,000 before. It's silly to compare this to the mongol empire.