system
Given the following post, respond as if you're commenting on Reddit:
human
[Halo] How did the UNSC become so powerful after the Human-Covenant war and pay for massive ships such as the Infinity?

The war cost humanity billions of lives and lost dozens of planets, some of which were very industrial such as Reach. After a massive war like this shouldn't humanity face massive economic problems that wouldn't allow such military projects to be built?
gpt
Automation?

It's kind of weird admittedly, but the way things sit, they've got huge amounts of leftover Covenant and Forerunner tech, a massive number of refugees, several lost planets and a need to find places to put all these people, human or otherwise. Why wouldn't they sink some cash in to projects like the Infinity, which was designed to go farther and faster than pretty much any ship before? Consider it a test run for a better class of Colony ship. Not to mention it was apparently being assembled mid-war and redesigned mid-way through to incorporate all this new stuff. Using it as a testbed for next generation tech beats leaving it a half-finished white elephant.