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Let me explain this with some cold hard facts.
The United States is currently the largest economy in the world, the most stable country and the largest military power in existence, in terms of advancement and numbers.
United States GDP
13,000,000,000,000 ~ 2008 Fourth Quarter. That is 13 trillion.
The entire world has a GPD worth of roughly 45-50 Trillion.
That is 6 Billion people extra, worth a total of 35~ Trillion.
Then we couple together the US and it's allies.
European Union- 16~ Tril
Japan - 8 Tril
So, in total, we have... 36 Trillion USD of monetary worth from the US and it's major allies.
That leaves the rest of the world, which in total is worth roughly 11 or 15 trillion, total. Spread over a much larger population.
US and Allies- Roughly 1.4 Billion People.
Rest of world - 5.2 Billion people.
You can see the ratios here, right?
Then we go into nuclear arms, no nation will actually use them, so they don't count in anything but fear factor.
By military means, the US and it's allies have the most advanced armies, navies and airforces around the world, while the major military powers of China and Russia have a lot of tanks, and artillery, and boats, but are about as advanced as the 1970's.
All information used in this post was provided from sources such as the CIA world factbook, world bank, and the UN.