These are corporations that are owned by the state and selected as national industries that can not be purchased by a private enterprise. The choice is for the president to decide which industries should be national. It is possible to change the status of a corporation between state corporation and national. Only 24 corporations may be marked as national industries. Typically you will keep the defense industry and may be also some of the high tech industry in government ownership.
Simcountry Dictionary
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These are corporations that are owned by the state and selected as national industries that can not be purchased by a private enterprise. The choice is for the president to decide which industries should be national. It is possible to change the status of a corporation between state corporation and national. Only 24 corporations may be marked as national industries. Typically you will keep the defense industry and may be also some of the high tech industry in government ownership.