Space

Those examples involved a "colonizing" culture that was nearly identical in technology and psychology to the "colonized" culture. If aliens exist and they travel here then they're from an entirely different culture that is likely millions or years removed from the state we're in now.

The proper analogy is not the British conquering the people of India, it's the British coming to a small island somewhere that's populated by monkeys. We're the monkeys. We likely won't be able to comprehend what the British are or what they want, let alone thwart their goals.