Final answer:
The Military-Industrial Complex is a concept describing potential collusion and influence among defense manufacturers, the military, and politicians, highlighted by President Eisenhower amid Cold War defense needs.
Step-by-step explanation:
The term Military-Industrial Complex refers to a concept introduced by President Dwight Eisenhower when he warned of the potential collusion between the nation's defense manufacturers, the military, and politicians. Eisenhower expressed concern about the potential for defense contractors to exert unwarranted influence on the U.S. government, particularly by lobbying and campaign donations to secure increased military spending. This matrix of relationships was created in part by the need for a strong defense during the Cold War and the reorganization of the U.S. military under the National Security Act of 1947, which established the Central Intelligence Agency and later consolidated the services into the Department of Defense in 1949.