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You can undermine and manipulate political factions in your empire by dividing them up and distilling them into different groups by changing the sectors they're in. He solves (maybe only temporarily) a problem with a rebel faction by isolating the system they call home and ripping it out of the sector and placing it into a new dummy sector with new systems who don't have any political ties to the rebels.
You can fucking gerrymander in Stellaris. Holy shit.