Well the modern study of hsitory helps us not make the same mistakes as we did in earlier history.
I believe it is D....
Hope this helps
Answer:
After the Spaniards introduced horses to Plains Native Americans, the lives of the tribes changed. Tribes became less settled and sedentary. The horse allowed them to hunt animals such as bison or buffalo, and, instead of staying in one place, tribes began to be nomadic.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be "primary and secondary sources", since the historian uses secondary sources to give background information on the topic in question, and primary sources to make an original point that adds to the body of research. </span></span>
