First of all, the opponent assumes with NO EVIDENCE, that a nation cannot govern itself with open borders. Now, let us think, who in a democratic society ELECTS the government? IT IS ITS PEOPLE! Thus we should maintain the capability of self-government which at NO POINT CONTRADICTS open borders, at NO POINT, does it state that a country cannot have a culture, only that it cannot be monocultural which is already impossible in a globalised world. The opponent assumes a perfect government with the community analogy WITH NO EVIDENCE LET IT BE KNOWN should hold. Let us examine this, AT WHAT POINT, can even THAT, govern a nation which cannot fulfill its economic duties? WHAT IS LEFT OF A NATION THAT CANNOT SUSTAIN ITSELF ECONOMICALLY? That would only drive collapse, not prosperity, so remember, that in such a world, it is only logical to prioritise a country's economic needs over others. Thus, countries should have open borders. I rest my case.