Why though? The only value of a black hole you can build would be as a doomsday weapon: do what we want or we end the world. Except...that's been the case sinc

Why though? The only value of a black hole you can build would be as a doomsday weapon: do what we want or we end the world. Except...that's been the case since the Cold War with regular nuclear weapons. As for fusion: you need to do more research. We've had fusion bombs since 1952. Practical fusion power for electrical generation is what we don't have since the constraints are very different.