USA HISTORY

Detailed explanation-1: -Spain and Portugal were the only signatories of the treaty because at the time, they were the only European powers to establish a presence in the Americas. The treaty did not consider any future claims made by the British, French, and other European superpowers of their respective times.

Detailed explanation-2: -The Treaty of Tordesillas was ratified by the Crown of Castile and the King of Portugal in 1494. The treaty divided the newly discovered lands outside of Europe into two equal halves, the east side belonging to Portugal, and the west to Castile (later to become part of Spain).

Detailed explanation-3: -Answer and Explanation: The Treaty of Tordesillas was far more beneficial to Spain than Portugal, at least in terms of the rights to new territories that the treaty granted.

Detailed explanation-4: -The Treaty of Tordesillas, June 7, 1494. On June 7, 1494, Spain and Portugal agreed to fix the boundary between their respective domains along a meridian 370 leagues west of the Cape Verde islands. They established two areas in which they would have a monopoly over discovery, navigation, and trade.