Civilization X was an ancient civilization. It was one of the most technologically advanced civilizations in the world. It perfected the use of iron. At first, iron was used mainly to make military weapons. This civilization used it to make strong, lightweight wheels for chariots. Civilization X used these chariots in battles. This combination of lightweight chariots and strong iron weapons helped them to conquer neighboring lands quickly and efficiently. Based on the passage, which of the following statements about civilization X is true?