Who cares
War and trade.
The Nazca and Moche civilizations were both located in close proximity to each other along the coast of modern-day Peru. It is likely that they interacted through trade networks or cultural exchanges due to their geographical proximity and shared cultural traits. Additionally, both civilizations existed during similar time periods, further supporting the idea of contact and awareness between the two.
Different civilizations have different ideals, beliefs, and attitudes, which may not be compatible with those of other civilizations, so when two civilizations encounter each other in some manner (immigration, war, the internet, etc.) there can be a conflict that results. We can call it a clash of civilizations.
Mayan, Incan and Aztec civilizations each developed calenders, mathematics, writing and other record keeping systems.
Egypt and the Fertile Crescent.
Civilizations engaged in the Indian Ocean trade network, such as those in East Africa, the Middle East, and South Asia, significantly influenced each other through the exchange of goods, ideas, and cultures. Trade facilitated the spread of religions like Islam and Hinduism, as well as technological innovations, including navigation techniques and shipbuilding. Additionally, the interaction led to the fusion of art styles, languages, and culinary practices, enriching the cultural tapestry of the region. This interconnectedness fostered a dynamic environment where local societies adapted and evolved, influenced by their trading partners.
the terrain allowed for nearly hidden civilizations to grow up right next to each other
It is believed that Archimedes was a younger contemporary of Plato, so they likely did not know each other personally. However, Archimedes was influenced by the works of Plato and other Greek philosophers through their writings and teachings.
since they were close to each other they helped each other
Organisms are influenced by biotic factors because every living organism (biotic factor) influence each other to complete the ecosystem by providing food for each other.
They influenced each other greatly.
Ever since civilization developed, many civilizations began warring against each other. Many militaristic advances changed the battlefield forever. Guns was likely the largest advance ever. Next would be either the airplane or navies. Either way, if we didn't have guns/planes/navies/other major arms, we'd be fightin' with each other with bows n' arrows.