In the United States, you are considered a U.S. Citizen just by being born in the United States. However, I imagine that there are situations where there is no proof that a child was born in the United States, but it would be reasonable to consider or assume that a child was born in the United States, such as finding an infant in the United States.
I know that there are a number of people who do not give birth to their child in a hospital. How do they prove a child was born in the United States, to then give them a birth certificate, therefore, citizenship? Do they trust a mother is telling the truth when she reports her child being born after-the-fact? Who/what agency does she report to, in that case?
What happens if an infant within the United States is found, but no witnesses relating to the child are locatable/found, such as the child's mother? Technically, there is no proof/witness of birth. Does this child get a birth certificate? Do they get citizenship? Where are they a citizen of? If they receive a birth certificate, what date were they considered born?
Was there some sort of court case that a court ruled that an infant found in the United States is considered born in the United States?