It is not enumerated in the Constitution as a right reserved by the Federal government. Therefore, it is a right reserved by the states or by the people. Though some have tried, no state has been successful at legislating how many progeny a person can have. Therefore, it is a right reserved by the people.

Perhaps Startup can give us the full skinny on this?

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In this country, we don't need reasons to make things legal; we need reasons to make things illegal. - Startup