Paradoxically at the end of World War Two the US awarded fewer campaign medals than Britain, a total of five, as opposed to the ten authorised by the British authorities.
These were
American Defense Medal - equivalent to the 1939-45 Star
European - African - Middle Eastern Campaign Medal- Atlantic, Aircrew Europe, Africa, Italy and France & Germany Stars
Asiatic-Pacific Campaign Medal- Burma and Pacific Stars
American Campaign Medal - Defence Medal
WW II Victory Medal - 1939-45 War Medal
Admittedly, once the Tufty Club type medals as displayed by our portly US Marine were added, US servicemen still ended up with rather more fruit salad on their chests than their British and Commonwealth comrades.