Aeroplane on the back of centuries of aviation research and experiments in Europe that had resulted in several successful flying machines,invented hot air balloons,blimps and helicopters and it's debatable if a German immigrant actually did it first and was copied by the Wright brothers because American born boys being the first just sounds better in the media.
You can have the first electrical air conditioner but the concept had already existed since ancient times and had been refined in Britain and Australia which aided the developmet of electrical air conditioners in the two minutes the USA has existed.
America did not invent the television. Just no.
Internet in collaboration with British and French research. The world wide web was invented by a British guy.
Which advances in the medical field in particular? Arguably the most important discovery was the discovery of penicillin, discovered by Scottish and Irish people working in London and Dublin, neither of which are in America.
Vaccines? No, invention and research in Britain.
Anesthesia? The use of gas was debatably first demonstrated by William T. G. Morton but modern anesthetics were researched in Europe with the ones we use today being discovered in Belgium for the most part.
Discovery of bacteria as a cause for infection and disease? In France
The X Ray? Germany
The USA did pioneer immunotherapy and organ transplants though as far as I know so yay for you.
The US didn't bail anyone else so much as use those wars to make money and be less scared of Russia by nuking a defeated country twice to show everyone their power level. American propaganda would make the population feel better about killing thousands of people for no reason by claiming that Japanese had a code that would never allow them to surrender as they were brainless savages like the natives they stomped all over to get more land. They then gloated about defeating Japan by humiliating their emperor and culture and attempting a few times to get them to speak English or stop using Japanese alphabets. At least Japanese children got some free chocolate and chewing gum.
Then after showing the Soviet's who is boss you proceeded to lose almost every single proxy war that didn't involve dumb Arabs trying to kick Jews out of their stolen Ottoman Turk land until Pizza Hut of all things defeated the Soviet Union. History books would later claim these losses were not embarrassing failures to achieve any real goals America had but tactical and a way to gain an advantage in diplomacy.
Seethe and cope.
its sad to see proud Farmers desperate for affirmation and asspats from Mr Moon
Nool isn't the only one with a healthy disrespect for Cuck Island and its inhabitants.