Hm, evo malo vise o tome:
http://en.wikipedia.org/wiki/G..._by_Monasticism_in_Mount_Athos
Naturalization by military service or by Monasticism in Mount Athos
Ethnic Greeks who are accepted to the military academies for officers or non-commissioned officers of the Greek armed forces (according to the special law governing each school) or who enlist in the armed forces as volunteers (according to the law governing each branch) acquire Greek nationality automatically from the time they enter the academies or they are enlisted. Moreover, according to the Greek constitution, aliens admitted as monks in one of the monasteries of Mount Athos, become Greek automatically.
Tako moze i americko drzavljanstvo da se dobije. Prijavis se za vojsku, pa dobijes drzavljanstvo. Tako su i u Starom Rimu davali gradjanstvo.