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.

zheng he was a chinese explorer who lead seven great voyages on behalf of the chinese emperor. his seven total voyages were diplomatic, military, and trading ventures, and lasted from 1405 – 1433. however, most historians agree their main purpose was to promote the glory of ming dynasty china.

explanation: