http://en.wikipedia.org/wiki/History_of_nuclear_weaponsThe first fission weapons, also known as "atomic bombs," were developed jointly by the United States, Britain and Canada during World War II in what was called the Manhattan Project to counter the assumed Nazi German atomic bomb project. In August 1945 two were dropped on Japan ending the Pacific War. An international team was dispatched to help work on the project. The Soviet Union started development shortly thereafter with their own atomic bomb project, and not long after that both countries developed even more powerful fusion weapons called "hydrogen bombs."
Lets talk jets.
Invented by the French, developed by the Brits, first used in combat by the Germans, and Perfected by the Americans when they made the F-15.