What was the primary purpose of the National Road?

The primary purpose of the National Road was to facilitate better defense and economic growth. Established in the early 19th century, the National Road was the first major improved highway in the United States built by the federal government. Its goal was to create a reliable transportation route that would help connect the more developed eastern states with the emerging western territories.

By enhancing transportation, the National Road played a crucial role in the movement of people, goods, and military supplies, which significantly contributed to national defense during a time of expansion. Furthermore, as settlers moved westward, the road supported economic growth by allowing for more efficient trade and commerce between regions, fostering the development of new communities along its path.

While the other options address different aspects of American expansion and growth, they do not encompass the comprehensive purpose behind the National Road as well as the focus on defense and economic integration. For example, while there were efforts to connect different areas of the country, the National Road specifically aimed to bolster economic ties and provide strategic advantages.