United States, Russia, china, germany, united kingdom, France, Japan, isreal, saudi arabia, united arab emirates, south korea, canada, iran, turkey, india, australia, switzerland, italy, swedan, quatar
The Gross Domestic Product is the way economic strength is usually measured. That's the total amount of money the economy has developed. It includes almost every and any thing that involves money. So if you buy a package of gum, that's part of the GDP. The 10 largest countries in trillions of dollars are
US
China
Japan
Germany
United Kingdom
India
France
Italy
Brazil
Canada
Debt Free Nations. You want to know this because these countries are very strong economically and can survive economic meltdowns. I have marked the ones with a (*) to show that this stat matters. (**) means the country has an extremely strong economy. East Timor may have no debt, but they also export next to nothing.
East Timor
Libya(*)
Afghanistan
Estonia
Russia(**)
Iran(**)
Nigeria
China(**)
Uzbekistan(*)
Kuwait(*)
Finally what you probably asked to start with -- the military.
US
Russia
China
India
Japan
South Korea
France
Italy
Germany
UK
The problem with the military list is that it lists weaponry. The problem is not conquering a country. The problem is occupying it. Ask both Russia and the US how they feel about Afghanistan. It has broken the economies of both countries.
The biggest reasons the U.S. hasn't adopted the metric system are simply time and money. When the Industrial Revolution began in the country, expensive manufacturing plants became a main source of American jobs and consumer products.
