Examining what it would take to realistically build an Imperial Star Destroyer, it was estimated in 2016 that such a vessel would cost $636 billion USD. Using then-current technology and naval vessels as a reference, the ship would weigh 4.44 billion kilograms, generate 146.5 gigawatts of power, and its engines would produce a combined total thrust of 3.5 million newtons. However getting the parts into space to construct the Star Destroyer would require an additional $44.4 trillion USD in launch costs, suggesting that asteroid mining and refining technologies would have to be developed first to make it more economical.[18][19]
Interesting
https://en.m.wikipedia.org/wiki/Star_Destroyer#Analysis
Huh, the current US national debt is around $35T, so we almost could’ve gotten a Star Destroyer. Priorities people!
Unfortunately the gubberment never spends money on what the people really want, like star destroyers