Final answer:
The Treaty of Tordesillas divided the New World between the Spanish and Portuguese, establishing their territories in the Americas and influencing the settlement of the region.
Step-by-step explanation:
The Treaty of Tordesillas was a treaty signed in 1494 that divided the New World between the Spanish and the Portuguese. It specified that lands and routes to the west would belong to Spain, while lands and routes to the east would belong to Portugal. This treaty had a significant impact on the settlement of the New World, as it established the Spanish and Portuguese territories in the Americas and determined which areas each country could colonize.