Compare maps of the world in ancient times with current political maps.

use the maps below to answer the following question.
compare the two maps. which geographical feature formed the western boundary of the plains native american cultural region?

a.) the appalachian mountains
b.) the rocky mountains
c.) the mississippi river
d.) the pacific ocean

Rocky mountains

Explanation: I'm not that guy how leaches off of other people's work but the correct answer is rocky mountains so ya the other guy was right to

PLZ BRAINLILEST

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).