Alfred Thayer Mahan, why was it important for America to develop a powerful navy?

For Mahan, control of the Caribbean was essential to control of the canal, which was essential for the protection of all three coastlines of the United States. As an essentially “island” nation, it was of the utmost importance that the United States protect its coastline and its interests with a powerful navy.Jul 27, 2015

The answer coastal regions and peary land