Which president cautioned the united states about the importance of monitoring the power of the military-industrial complex?

Dwight Eisenhower.

Explanation:

In his parting speech from the White House, on January 17, 1961, President Dwight Eisenhower warned the nation about what he termed as the military-industrial complex, meaning the union of defense contractors and armed forces, on what Eisenhower considered a menace to democratic government.  

He remarked the cost of an arms race with the Soviet Union, which would take resources away from important areas.

the enslavement and death of yeet

by 1880, germany had more rail lines than great britain and russia.