Vitoria expands his thesis. There exists this same divine law--_jus inter gentes_--between all States. The States are interdependent. There is a _societas naturalis_, a natural Society of Nations. The link is God. Free to the Spaniard to assume that God’s agent in the link be the king of Spain. The world is one society: and between peoples of one society peaceful intercourse may not be forbidden. France may not impede a Spaniard from visiting France, even from settling in France, provided he violate no law and cause no damage. If this is true between Frenchman and Spaniard, it is true between American and European. Through the fact of their civil rights in a society of nations the Indian cannot exclude the Spaniard. There exists therefore _jus communicationis_: the right of immigration. There exists also the freedom of the seas. Spain stands justified in her American penetration. We are at the mere beginning of Vitoria’s subtle structure. _Jus commercii_--the right of commerce--applies not only to the exchange of merchandise between free peoples, but as well to the exchange of ideas. The Spaniard has the right to preach the Gospel to the Indian. The Indian has the right to preach heathenism to the Spaniard. Either may resist conversion (even as either may decline to purchase proffered goods). Since no State may prevent a stranger from settling on its lands, nor even from becoming a lawful national, here are the Spaniards legally at home in the Americas. But strong Powers must defend by arms the menaced liberties of smaller States. That is a prerogative of a true society of nations. How much more readily therefore shall strong Powers defend the menaced liberties of individuals in every State! All States are “organs of human justice.” Spain shall protect the innocent from “religious sacrifice” and “from cannibalism in America.” If need be, to protect the innocent, a State may subjugate wholly an unjust nation. The theologian brings to Spain her “cosmic place” in the Americas as Christ’s agent in the society of nations. But this is not enough. That she may be at peace in Zion, she must be alone. So Vitoria evolves in 1500 the modern theory of “spheres of influence.” Pope Alexander was _divinely_ just in submitting to Spain and Portugal, as God’s best tools, the mission of Christianizing the Americas. But the Pope had no _human_ right to partition the property of the red man. Vitoria with all the Dominicans behind him stands against Pope and king: declaring that “the Indian has as much right to possess property as the Catholic peasant.” The Indians, he holds, are potential equals of the Spaniards. They have the right to plebiscite. A majority of their votes alone can justify America’s _annexation_ to the empire of Spain. Beyond the divine and human privileges that are general in a society of nations, “Spain must commit no act in the New World, except by treaty.”