Why doesn't America make huge spaceships?

It's not that I don't want to build it, it's just that the current technology is impossible. Building a huge aircraft carrier that can sail at sea is the highest technological crystallization of modern human industry.

It is not a simple matter to realize the huge weight of objects flying in the sky. There are many factors to consider, such as aerodynamics. Not a shape that can fly in the sky. As far as we know, the brick-like spacecraft in the movie can't drift in space, and there is no buoyancy and flight power to have such a huge thrust support. As for the flying saucer, I can only say that it is alien technology, and I don't know how it was realized.

In addition, there is the problem of aero-engines. It is not so simple to study a high thrust engine. For example, the J20 engine in China has just been produced for so many years. Similarly, although the technology of the United States is high, it is not much higher, and it is impossible to be higher by one dimension. If you want to realize the kind of spaceship you want, you can only go to the paradise of the second dimension.

The most important thing is that they have no money to do it. After the service of the International Space Station expired, they had no money to build another one. They want to take a ride in China, so that they can be spaceships? The master of congress said, you must be crazy! As far as their declining national strength and military spending are concerned, how can they afford such impractical things?