Prior to the Second World War, the estimated population of the United States was 130,879,718. As of 2014, the population is 316.1 million.
It isn't, you may be thinking of the world wide Influenza outbreak of 1918-19 that killed more United States troops than the war did.
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For many years it was the British Empire. At the present the United States commands the greatest navy.
I don't know the full list but it consists of countries such as Russia, the United States of America, North Korea, France, United Kingdom, China etc... I believe Russia has the most at approximately 2,200 nuclear bombs.
313.9 million (2012)
United Nations
There are descendants of Anglo-saxon invaders amongst the present day population of the United Kingdom.
The duration of Enigma tornado outbreak is 15 hours.
The population of United Supermarkets is 10,000.
The population of United Supermarkets is 2,009.
United Coffee's population is 1,000.
The population of United Tractors is 14,500.
The population of United Tractors is 2,010.
United Internet's population is 2,010.
United Online's population is 1,700.
United Devices's population is 2,007.