The European colonization of the Americas fundamentally changed the lives and cultures of the resident Indigenous peoples. Although the exact pre-colonization population-count of the Americas is unknown, scholars estimate that Indigenous populations diminished by between 80% and 90% within the first centuries of European colonization. The majority of these losses are attributed to the introduction of Afro-Eurasian diseases into the Americas. Epidemics ravaged the Americas with diseases such as smallpox, measles, and cholera, which the early colonists brought from Europe.

the answer for 3 is b and the answer for 4 is d

when studying cause and effect, historians usually group the causes into different categories. for example, cultural causes reflect how a society’s literature and art convey the way the society saw itself in relation to the rest of the world. another resource that historians use to understand society is pop culture, which tells them the trends and ideas that are preferred by the common people. when studying cause and effect, it’s important to remember multiple causation, or the idea that an effect could have several causes and vice versa.  

the correct option is “cultural causes” since art and literature are related to the culture of a place. culture is determined by literature, art, music.

the correct option is “pop culture” since it reflects the likes and ideas of common people whereas the rest of the options do not focus on common people.  

the correct option is “multiple causation” since it refers to the idea that events are caused by multiple reasons, not just a single one.  

these civilizations were located around fertile rivers, where they could produce an abundance of crops