Actually a joint effort by American, Canadian and British scientists not all American as many people would have you believe.
The Manhattan Project was an effort to create an atomic weapon. Many scientists involved regretted their efforts immensely when Hiroshima and Nagasaki disappeared.
An armoured vehicle, first invented by the British and possible also the French in WW1. To be a tank it must have tracks and a 360 degree rotatable fully enclosed turret.
The greatest tanks of the modern age are:
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