The relationship between the inland empires of Wari and Tiwanaku was likely affected by their shared border in a number of ways. Both empires were located in the central Andes region of South America, and they dominated the region for several centuries during the first millennium AD.
One way in which the shared border may have affected the relationship between the two empires was through economic exchange. The border between Wari and Tiwanaku likely served as a conduit for trade and exchange of goods and resources, which could have helped to strengthen the economies of both empires.
Another way in which the shared border may have affected the relationship between Wari and Tiwanaku was through cultural exchange. The two empires likely had significant cultural influences on one another, and the shared border may have facilitated the exchange of ideas, customs, and traditions between them.
Finally, the shared border may have also had an impact on the political relationship between Wari and Tiwanaku. The two empires may have had to navigate complex political dynamics in order to maintain good relations, and the shared border may have played a role in shaping these dynamics. Overall, the shared border likely had a significant impact on the relationship between Wari and Tiwanaku, and it likely played a role in shaping the histories of both empires.