Grounds for losing citizenship if born in US - conviction for treason or attempting by force to overthrow the U.S. government, including conspiracy convictions.
PS: I read the SC ruling prior to this post and it appears that only what is posted ^ is the only way a natural born citizen may lose his citizenship.\
That being posted, how is it a US born citizen who has been convicted of a crime spends time in jail can lose his right to vote? All citizens have that right otherwise they are not citizens. One way of looking at it.
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