What did the Treaty of Tordesillas of 1494 accomplish? 1) It reestablished the border between Spain and Portugal to compensate for Portugal's claim to Asia. O2) The treaty gave Spain rights to one-half of the Atlantic and gave Portugal claim to the other half. 3) 4) The treaty, while giving Spain and Portugal advantages, allowed for limited exploration of the New World by other countries. It divided the world into spheres of influence for the different European nations.