They argue because they do not know what they are talking about. There is no way possible they know what happened, the only way you truly know what happened in WWI is if you were in it.
The Mexican society wasn't united, since they were constantly fighting with each other. Since soldiers were killed, they also lost military power. When the Spanish arrived, they had a strong military, but also diseases, which killed Mexican soldiers. That made the home society vulnerable.
Have a nice day! :)
Civilian property was destroyed as a tactic to accelerate the war.
Rhode Island was the only state to not send representatives
McClellen became the lead general of the North after the Battle of Bun Run. And Grant was general that won several costly victories out west along the Mississippi River.