Religion was less practiced, and humanism was formed. It formed into a more secular culture. This means that people were more focused on worldy things than God or religion.
It can. The mexican-american war also dealt with the future of the territories that were involved like the Texas territory. Since the United States won the territories from Mexico, the new colonies wanted to be slave colonies, and the general government disliked this. There would've been fewer slave colonies if they hadn't been conquered.
Robot machines that do factory work a lot faster and nicer than humans