delegint restraining my answer so yeah
I think that because everyone else has their own brain that is active in their own way meaning that some are altruistic due to the way they whereas others are not as much because they are thinking differently
The first one is the correct one
They did not like the idea at all. They wanted land period. The fact that the United States wanted their country to streach from coast to coast and that this land belonged to them anyway (according to manifest destiny) ment that Mexico would have to give up their claims or go to war for that land.
I believe Correlation is not causation" means that just because two things correlate does not necessarily mean that one causes the other. As a seasonal example, just because people in the UK tend to spend more in the shops when it's cold and less when it's hot doesn't mean cold weather causes frenzied high-street spending.
