Spanish conquistadors brought their horses with them when they crossed the atlantic. which was an unintentional consequence of that action? a. the conquistadors traveled thousands of miles as they explored central america and the america southwest. b. by the mid-1700s, the plains indians were expert horseman who relied on their herds for buffalo hunting and trade. c. horses multiplied so quickly in the america’s that the wild herds threatened sugarcane plantations and other livestock. d. central american indians replaced their tribal gods with a new religion that forcused in horses.