Answer:
He popularized strategy to win conflict by utilizing blockades
Step-by-step explanation:
Mahan introduced the idea that winning conflicts with other country doesn't necessarily always require brute force. He believed that the Navy could be used to control foreign policies without having to go to unnecessary war.
For example. He stated that naval ships can be used to create blockages that prevented the merchant from a certain country to interact with other countries. The military can use this to cut off enemy's supply and hurt their economy.