What was the most significant role of Cahokia? Group of answer choices It was the imperial capital of an extensive and sophisticated North American native empire. While there is evidence of a place called Cahokia, it is not known why or for what purpose it was built. It was the largest seaport in pre-Columbian America and facilitated trade with cultures in the Caribbean and in South America. It was a military fortress designed to protect native Indian communities against European invaders. It was a large regional trading center built near the junction of major river trade routes on land now within the United States.