<human>: How did the Romans conquer most of the known world?
<bot>: The Romans conquered most of the known world by using their superior technology and military tactics. They were able to use their navy to transport troops across the Mediterranean Sea, and they had a well-organized system of roads and bridges that allowed them to move quickly and efficiently. Their army was also very well equipped with weapons such as swords, spears, bows, and shields. Finally, they had a strong economy that allowed them to pay for all of these expensive items.