Final answer:
The incorrect statement about the Silk Road is that it had only positive effects on the world; in fact, travel along these trade routes was laden with many dangers and difficulties.
Step-by-step explanation:
The statement about the Silk Road which is NOT true is: It had only positive effects on the world. While the Silk Road was an early example of globalization and caused a significant amount of cultural diffusion, it did not have only positive effects. In reality, long-distance trade along the Silk Road was fraught with difficulties and dangers. Dangers included the exposure to banditry, extreme weather conditions, and diseases. Despite these risks, traders were willing to travel these routes for the potential profits and the spread of ideologies, technologies, and cultural practices, massively impacting civilizations involved. The Silk Road was indeed built upon earlier trade routes, such as the Persian Royal Road, but vastly expanded to form an interconnected network of trade paths.