How did the treaty of tordesillas affect spain and portugal?

One aswer is that it was  aimed at settling conflicts over lands newly discovered or explored by Christopher Columbus and other late 15th-century voyagers, so spain got one side and portugal got another side  Spain was given exclusive rights in the regions west to the line and portugal east of the line

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).

the  wilmot proviso  was designed to eliminate  slavery  within the  landacquired as a result of the mexican war (1846-48). fearing the addition of a pro-slave territory, pennsylvania congressman david  wilmot proposedhis amendment to the bill.