Final answer:
Ancient Romans developed networks of highways, waterways, and other transportation for military purposes, trade and commerce, and improving living conditions in cities.
Step-by-step explanation:
Ancient Romans developed networks of highways, waterways, and other transportation for several reasons. First, these transportation systems allowed the Romans to efficiently move troops and supplies across their vast empire, which helped them expand and maintain control over conquered territories.
Next, the networks of roads and waterways facilitated trade and commerce, allowing goods and resources to be easily transported between different regions. This economic activity contributed to the prosperity and growth of the Roman Empire.
Lastly, the Romans built aqueducts to transport water to their cities, which improved sanitation, enabled the construction of public baths, and supported a healthier lifestyle for the Roman citizens.