What was the purpose of water routes?

Transport by inland waterways may be by navigable rivers or those made navigable by canalization (dredging and bank protection) or on artificial waterways called canals. Many inland waterways are multipurpose, providing drainage, irrigation, water supply, and generation of hydroelectric power as well as navigation.

provided drainage, irrigation, water supply, and generation of hydroelectric power as well as navigation

Explanation: history

your answer is

to dominate europe

and i know for a fact it can't be the others

sam houston basically made tx he fought for anrew lead troops in the battle of san jacinto and then became president and james polk