How did the Treaty of Tordesillas “salvage” Portugal’s claim to lands in the New World (Western Hemisphere)?

Hoping to salvage Portugal's Atlantic holdings, King João II began negotiations with Spain. The resulting Treaty of Tordesillas in 1494 drew a north-to-south line through South America; Spain gained territory west of the line, while Portugal retained the lands east of the line, including the east coast of Brazil.

Explanation:

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a memoir is the correct answer

that would be the steamboat because none of the other things are forms of transportation