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If aliens invade the earth, will the world Coalition government be established?

I think it should be, even if it is not necessarily useful, but people all over the world should have the heart of unity against the enemy.

I have read several answers that the gap between the science and technology of the earth and the alien civilization is too great to resist. Then I want to ask them, have you seen aliens or something? How do you know that they are very skilled? You can't say that aliens are poor. Also, aliens invaded the earth, I don't know how many years later. By that time, no one can predict to what extent the civilization of the earth has developed. Maybe the earth will have entered the luggage age by then, so why can't it resist?