If you're referring to Napoleon's Spanish Iberian peninsula campaign between France and the coalition of Spain, Portugal and England from 1808-1814 there were three critical reasons for its failure and one main critical importance for its failure.
The three critical reasons for its failure:
1) Napoleon greatly underestimated the fierceness and will of the Spanish fighting spirit.
2) Chiefly because of reason 1) above, the vastness of the Spanish frontier and the resources required to occupy & hold territory bled his army dry.
3) Napoleon did not expect the coalition arrayed against him to hold as strongly as it did.
The main importance of its failure was that, due to Napoleon's overly ambitious tenancy to overstretch and string-out his resources, his other armies in other theaters of war were left under strengthened.
Answer:
2.75 million men were in the civil war and 620 hundred thousand died
Explanation:
Well I think the answer might be D.
Answer:
Over a million people died, people were displaced and Britain lost India
Explanation:
True because it would lead United states into wars with countries they may not have planned to be at war with and there will be more united states citizens that our country man not be able to control.