system
Given the following post, respond as if you're commenting on Reddit:
human
[World War Z book] What's the point of trying to reconquer the whole USA?

In the book it's explained that California is home to the new US government and its focused on rebuilding. That said, they still suffer from acute resource shortages and fuel is so scarce that plenty of people have to walk for hours every day and burn wood for heat. Hunger and crime are still big problems. This isn't a country in any shape whatsoever to start a massive conquest campaign. 

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Is California still a democracy? Or ruled by a military junta? Because i can't see why the people would support a massive war that will gobble up most of their resources while they have so many problems at home.

And sure, nationalism and the american dream could help start the war. But the thousands of body bags coming back home would certainly end support for the war long before they reach the east coast.

What's the big hurry? At least wait until California regains its pre zombie economy before starting this campaign. And by the way, there is still a chinese sub carrying nukes sailing around the world. So maybe defense budgets should focus on defending California.
gpt
They want america back. It might not be the sensible play, but it's their country.

And to be fair, once you understand what's happening, zombies aren't that hard to fight. The initial losses were down to confusion, denial and trying to fight zombies like you'd fight a human army. Once you know what you're doing, taking down zombies isn't necessarily a huge undertaking.