What evidence proves cross-cultural exchange between minoan and cycladic cultures during the bronze age?

I believe the answer is: Common themes are found in the art of both cultures.

For example, we found a very similar sea-themed artworks from both civilization. Which indicates that at some point of time, these two cultures develop a method to travel through the sea and conducting a cultural exchange or economic transaction with one another, and cultural assimilation also happened during the process.

the historians cited in the article all agree with one another about the cause of the civil war. despite coming from different backgrounds and cultures, the historians agree that slavery was the root cause of the civil war. the fact that all these historiansgenerally agree with one another makes their shared viewpoints more reliable and valid, especially because the historians have different backgrounds and all work for the well-respected institutions of howard university, clemson university, and the university of colorado.