The Treaty of Tordesillas was a binding agreement between Portugal and Spain. On the 7th of June 1494, the governments of Spain and Portugal agreed the treaty of Tordesillas.
The terms of Treaty of Tordesillas divides the land in the Americans between the two nations irrespective of the people who were already living there. They divided the new world by drawing a line in the Atlantic Ocean, about 370 leagues west of the Cape Verde islands, then controlled Portugal. All lands east that line were claimed by Portugal. All lands west of that line were claimed by Spain.
The treaty ignored any claims of British and French and Russian of any parts of the Americas.