Supporters of Mahan's ideas most likely favored a foreign policy that emphasized the importance of building a strong navy, expanding territorial holdings, and increasing influence through maritime power projection. They would have likely supported policies geared towards securing sea lanes, protecting trade routes, and ensuring naval dominance as a means of achieving national security and economic growth.
His take on the important role of sea power in the world
The rise of modern steel navies from the 1890s through the 20th century.