That said... Civilization 1 is brutal and broken. Expect no mercy as the computer flagrantly cheats to make up for AI limitations when playing on higher difficulty levels. There are also a great many events that happen in the game that lack explanation (in fact the game doesn't even tell you they are happening). One example of this is your civilizations production getting cut in half as soon as 1 A.D. hits.
Sid Meier's Civilization IV Complete [GOG] cheat codes
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