The reason it was such a huge mistake was because the weapons were much more modern during the Civil War. Napoleon had weapons that fit to his strategies which was why his strategies were so famous for his day in age. The weapons they used in the Civil War were more powerful, and much more accurate.
<span>The Political Instability Task Force (PITF), formerly known as State Failure Task Force, is a U.S. government-sponsored research project to build
a database on major domestic political conflicts leading to state
failures. The study analyzed factors to denote the effectiveness of
state institutions, </span>
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It included all except for C: Cortes.
I think Nigeria but i am not sure sorry i hope this helps :)