The war between the U.S and mexico took place because the U.S decide they wanted to expand across the North American continent, which caused them to clash with all of it's neighbors including the british, the Mexicans and the Native Americans. Americans began migrating to the west even into land that did not belong to the United States.When Plok came into Office in 1845, he believed in the idea of "Manifest Destiny" hwich was the belief that expanding the U.S throughout the continents was both lawful and necessary.
Women were looked at as a cause of sin, even though the doctrine said they were viewed as equal. Many went into monasteries to prove their worth, devotion, virtue and to ensure the survival of their families and their souls. They were treated as were treated as inferior to men.
Religion (mostly Christianity)
Okay, the other answer is wrong. The Electoral College's votes are what decide if you can be president or not. So people who actually became president (like Lincoln) did recieve enough votes from the Electoral College. However, during his own election, Al Gore didn't get enough votes from the Electoral College in the Presidential Election in 2000. That's why he lost the election, even though his popular vote was higher.
Hope this helps!