History /
Why did Russia attack Poland in WW2? [178]
Everyone had them.
No, electric submarines which could operate entirely submerged were a German invention.
en.wikipedia.org/wiki/German_Type_XXI_submarine
Everyone had it.
No, submarines with air-independent propulsion were built by other countries only in the 50s.
en.wikipedia.org/wiki/Air-independent_propulsion
Everyone had the technology, it just was not economic enough to build them, not even for the Germans, see fuel consumption, basically all inventions you listed either existed as counterparts or had been in design stage and not produced for economic reasons.
All these technologies were first built by Germany, and many post-war designs of the Soviet Union and the USA are based on German designs. You have to wonder why they didn't use their own design, since they, according to you, all already had the technology.
Assault rifles have been designed and even built decades before WW2, Germans just started mass producing one, they did not invent nor were they the first to field one (Russians or French were).
Since you know so much, please add your knoweledge to this article:
en.wikipedia.org/wiki/Sturmgewehr_44
LOL, the name "assualt rifle" is even based on the German word Sturmgewehr, and the AK-47 is based on this German design... :D