US ARMY number of active divisions?

Someone tell me in this day and age since there's about 300 million american citizens, why the Army doesn't have 1.5 million combat designated troops, then could you explain why in a real war why we cannot mobilize and be at full combat strenght of 4 million combat designated troops, just in the Army.
 
Unless we are trying to fight the entire world I doubt we need 4 million troops. We have allies, they add their 2 cents so we dont need as many. Im sure if a super major conflict breaks out we could add allot more troops.
 
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