UNITED STATES ARMED FORCES TOTAL STRENGTH AND CASUALTIES
IN WORLD WAR II, DEC. 7, 1941-DEC. 31, 1946
Service--Total strength--Battle deaths--Deaths from other causes--Wounds(1)--Captured or missing
Army(2) 11,260,000 234,874 83,400 565,861 135,524
Navy 4,183,466 36,950 25,664 37,778 2,429
Marine Corps 669,100 19,733 4,778 67,207 1,756
Coast Guard 241,093 574 1,345 955
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Total 16,353,659 292,131 115,187 671,801
Never underestimate America and its involvement in WW2.(Not bad going for a Colony)
Without them and Russia ,the UK would have had a rougher war and would possibly have lost.
http://www.ramskov.nu/krih/ww2/001/16.htm