<span>Spoiler effect: it is the effect of votes splitting between ballot questions, or the candidates of the election. </span>
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! :)
The border states were important to the north during the Civil War because they were slave states that could have joined the Confederacy. *put into own words*
