1.What was the purpose of the Treaty of Tordesillas?

A.
to end a war between Spain and Portugal

B.
to end a war between Portugal and Muslims

C.
to divide the non-European world between Spain and Portugal <------

D.
to settle the terms of a trade agreement between Portugal and Muslims

2. forgot Number 2.

3. Which effect did Spanish and Portuguese colonization have on South American Indians?
A.
Warfare, disease, and harsh treatment, including being forced to work in silver mines or sugar plantations, caused the deaths of many native peoples.<-------------

B.
South American Indians were assimilated into the European ruling class.

C.
Spanish and Portuguese colonization had less effect on South American Indians than it did on those native people living in Central America and the Caribbean.

D.
Many South American Indians emigrated to other parts of the Spanish or Portuguese empires.

Just want my work to be checked!

Agree with 1 and 3.

From Internet, so you can check on your own:

The Treaty of Tordesillas, signed in Tordesillas, Spain on 7 June 1494, and authenticated in Setúbal, Portugal, divided the newly discovered lands outside Europe between the Portuguese Empire and the Spanish Empire (Crown of Castile), along a meridian 370 leagues west of the Cape Verde islands, off the west coast of Africa. Wikipedia

are they right?

To answer question 1, the purpose of the Treaty of Tordesillas was to divide the non-European world between Spain and Portugal. This can be understood by studying the historical context of the time. In the 15th century, Spain and Portugal were two major naval powers and were expanding their territories through exploration and colonization. The Catholic Church, wanting to avoid disputes, mediated between the two nations and negotiated the treaty. The treaty drew an imaginary line in the Atlantic Ocean, establishing a division between the territories that each country could colonize and explore. Spain was granted the rights to most of the newly discovered lands in the Americas, while Portugal gained control over territories in Africa, Asia, and present-day Brazil.

Regarding question 3, the effect that Spanish and Portuguese colonization had on South American Indians was that warfare, disease, and harsh treatment caused the deaths of many native peoples. This can be understood by examining the historical impact of colonization in South America. Spanish and Portuguese conquistadors arrived in South America in the early 16th century and implemented various colonization policies. These policies included forced labor in industries such as silver mining and sugar plantations. Additionally, the introduction of new diseases, to which the indigenous populations had no immunity, resulted in widespread epidemics and a significant decline in the native population.