[rstuart4133]

> US non-interventionism was the norm for the longest time.

US practised non-interventionism when wasn't the dominant world power. It's existed for 229 years, only in the 75 years after 2 world wars dethroned Britain did it become dominant. Since then its pretty much continuously projected it's power using miliary means across the world.

Look around, and you'll notice most countries are non-interventionist. That includes countries that were once attempted to colonise the world - like Britain, France and Spain. I guess once it was clear they could not take on the USA single handedly, they stopped spending on their military. Looked at as an asset that generates a return, what use is it if you have to ask the USA for permission to use it?

The corollary is if the USA loses it's "dominant military power status" military spending will probably drop back to the levels of other countries. It's held the position for 75 years, but if current trends continue it won't make 80 years.

I guess the obvious candidate for taking on the role of "dominate power" is China. Given they way they've been building up their military, it's almost like they are preparing for it. Their major competitor for the position will be India.