> After a few centuries the martians would push the technological boundary far beyond what we have now and give Earth the motivation to follow suit to ensure so

> After a few centuries the martians would push the technological boundary far beyond what we have now and give Earth the motivation to follow suit to ensure sovereignty. Native Martians would not be able to invade and occupy Earth on account of their adaption to Mars' much lower gravity. Even aside from them having to handle their weight tripling, they'd be facing major medical issues.