Why was it necessary for marshall to take explain why navigation should be considered as aprt of commerce?

Marshall emphasized that navigation is integral to commerce because it facilitates trade and the movement of goods across regions, thereby supporting economic growth. By recognizing navigation as part of commerce, it ensured that federal regulations could apply to interstate and international waters, promoting a unified economic framework. This perspective underscored the importance of a strong federal role in managing navigational routes, which are critical for the nation’s economy. Ultimately, it highlighted the interconnectedness of transportation and trade in fostering a robust economy.