Context: The Spanish Empire and other Europeans brought horses to the Americas. Some of these animals escaped and began to breed and increase their numbers in the wild. The re-introduction of the horse, extinct in the Americas for over 7500 years, had a profound impact on Native American culture in the Great Plains of North America and of Patagonia in South America. By domesticating horses, some tribes had great success: horses enabled them to expand their territories, exchange more goods with neighboring tribes, and more easily capture game, especially bison.

Question: What Empire brought horses to the Americas?
Answer: Spanish

Question: How long had horses been extinct in the Americas prior to their re-introduction?
Answer: 7500 years

Question: What kind of impact did the re-emergence of horses have on some Native American cultures?
Answer: profound

Question: What did some tribes achieve by domesticating horses?
Answer: great success

Question: What enabled some tribes to expand territory, increase trade and capture more game?
Answer: horses