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.
Answer:
the answer to that question is a civil war
Wants and needs is predominantly caused by brains in order to fulfill what our body considered missing. In order to fulfill this, our brain tend to give signals that make us focus to make that fulfillment before we could move on to others.
Because of this, our perceptions tend to be catered in order to finish this fulfillment. (for example, starving people may create a perception where they see anoher objects as an actual food)
He is probably experiencing Alzheimer's disease. Alzheimer's disease is primarily degenerative brain disease with characteristic changes in brain. Symptoms in Alzheimer's dementia are different for each patient. the most common are: forgetting of immediate past events, difficulties in carrying out everyday activities, unexplained mood swings, depression...