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Wars are always about limited resources. Religion, politics, beliefs, philosophies, laws, traditions all boils down to getting a bigger share of the pie for your side. Ironically, space exploration might make wars obsolete for a while. There's so much real estate on other planets that you can simply bugger off if you don't like your neighbours.
Only if colonising other planets is easy, which there is no reason to believe it will be.
We just don't have the technology to massively change a planets ecosystem to be habitable and the amount of resources to build a life dome is just absurd.
It's nice to go outside sometimes but I don't do it often. Worst bit would be some luxuries. Mostly food variety and ingredients.
We don't need full on domes; pressurized buildings would be enough. But if we can populate other planets we can populate the unpopulated parts of Earth.
With the current resources we have I feel it would be prudent to stay underground rather than build mega structures on ground.
There's no other habitable planet in our system (requiring heavy life support is not sustainable), and even the closest inhabitable exoplanet is probably out of reach for at least the next millennium.
Don't wanna die in war? Well it is your responsibility, random infantryman, to establish diplomatic relations then
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