What warning does Mahan give in having a navy WITHOUT the acquisition of colonies?

Mahan warns that a navy without colonies is ineffective, as it lacks the necessary bases for refueling, resupply, and strategic positioning. He argues that a strong naval presence requires secure coaling stations and territorial control to project power globally. Without these colonial possessions, a navy may become an expensive liability, unable to assert influence or protect national interests effectively. Ultimately, he emphasizes that maritime strength must be supported by territorial expansion to achieve lasting security and prosperity.