Cryogenic Rocket Technology Is a Very Highly Sought After

Any rocket engine that uses cryogenic fuels is called a cryogenic engine. They are essentially giving off water vapor at extremely high pressures and temperatures. And yet it produces an extremely high pressure, high temperature flame exhaust. Very few nations have the capability of developing crogenic engines. So i don't know how many nations have developed this. The uk had it, they scrapped it because the americans made them scrap it. India has it. The chinese have it. The japanese have it. As far as i can think of, these nations have craogenic rocket technology.