Cause and effect essays examine the relationship between causes and effects by focusing on why or how something occurred. There are four types of causes: necessary, sufficient, contributing, and remote. A strong cause and effect argument establishes a balanced relationship between the cause and effect and avoids logical fallacies like post hoc reasoning. The movie Charlie's War presents a cause-and-effect chain that links a remote cause in 1979 to the ultimate effect of 9/11 through a series of intermediate steps.