"But every man is born free, and therefore the son of a citizen, when arrived at the age of reason, may consider whether it is well for him to join the society in which he happens to be by birth. If he does not find that it is to his advantage to remain in it, he has the right to leave it…"
The Law of Nations

"All peoples have the right to self-determination; by virtue of that right they freely determine their political status and freely pursue their economic, social and cultural development."

"All armed action or repressive measures of all kinds directed against dependent peoples shall cease in order to enable them to exercise peacefully and freely their right to complete independence, and the integrity of their national territory shall be respected."
1514 (XV) United Nations Declaration Granting Independence to Colonial Countries and Peoples

"A refugee is someone who has a well-founded fear of being persecuted for reasons of race, religion, nationality, membership of a particular social group or political opinion, is outside the country of his nationality and is unable or, owing to such fear, is unwilling to avail himself of the protection of that country; or who, not having a nationality and being outside the country of his former habitual residence as a result of such events, is unable or, owing to such fear, is unwilling to return to it." Article 1 (A) section 2 of the 1951 Geneva Convention