In 1885 when Mitt Romney's ancestors moved to Mexico, the Mexican government passed a law requiring Americans that wished to immigrate to renounce the American citizenship and become Mexican citizens.
The 1882 the Edmunds Act stripped polygamists of the basic rights of U.S. citizenship, denying them the right to vote, serve on juries or hold office. Not dissimilar to current immigration raids where U.S. federal agents hunted and arrested polygamists. They were forced to leave the country or risk jail.
It is absolutely clear that Mitt Romney is NOT a Natural born Citizen unless he can prove that George Romney gained citizenship from naturalization prior to Mitt’s birth in 1947.
Mitt's father George was born in Mexico in 1907 and was from the time of until his death he was a Mexican citizen. When George Romney returned to the United States in1912 he misrepresented himself as an American citizen. George remained in the United States and pretended to be an American citizen.
George never applied for citizenship and thus remained a Mexican citizen for his entire life.
George Romney never became a citizen of the United States. His son became a citizen of the United States because he was born on U.S. soil, but because his parents were not citizens of the United States, he was not and is not a Natural born Citizen.
According to "The Law of Nations" which was the book that was referenced in Article I, Section 8, natural born citizen is defined as an individual who at the time of their birth had parent(s) with undivided loyalty to a particular country.
To be a Natural Born Citizen the father of the individual needs to be a citizen of the United States. If a person had parents possessing the citizenship of two different countries, they would have divided loyalty. This would disqualify their offspring from being a Natural Born Citizen.