3 requirements for a successful civilization

"America will be the last Superpower, Here'a Why"

It's really not as political as the title seems, but i found it very interesting for the elements on how geography and technology affects a nation or regions success. Such as how Britain went from being a leading superpower due to its deepwater port friendly coastline and distance from the mainland kept it isolated from European conflict until the advent of aircrafts, which made the english channel less of a barrier, and the shallow coastline of africa leaves it with the fewest natural ports of any other continent.

Anyway, i found it incredibly interesting and useful. I've have two nations in my world, one incredibly strong militarily, and the other with a strong navy. Thinking of this in regards to the natural formation of coastlines relaly helped me visualize how geography and terrain would affect culture and economic development. Hopefully the video's title won't turn anyone off, as i found the content quite useful.