We are all apart of God's family no matter the religion ,but we all have different ways in how we worship and how we get to heaven. Which makes us argue about who is right and wrong.
Slavery started because people liked having other people work for free, so they enslaved others. They were brought by ships from Africa. They would usually work on farms and ranches. The jobs were different because of the climate. One type of climate made it possible to grow cotton, another to grow tobacco, another for crops, and so on. They were important because they were free. Since wealthy land owners didn't have to pay workers, they got extremely rich because they had almost no losses at all.
Whigs opposed the war because many of them thought that going to war with mexico would encourage slavery expansion and allow the US to gain new southwest territories
The Aztecs, Incas, and Chinese, all had well developed civilizations, and they all used labor force or tributary system. All of them though has different systems and requirements in this department.
The Aztecs had lot of conquered people. They required tribute in the form of people for sacrifice. As the Aztecs has Gods that were very thirsty for human blood, in order to not sacrifice themselves, the Aztecs were taking people for the other tribes and sacrificed them.
The Inca system of labor force seem to have been the most just one. In this system, everyone, apart from the emperor, had to work for the good of everyone and for the good of themselves. Everyone lived in same homes, wore the same clothes, and worked the same types of jobs.
In China, the tribute system was based on forced labor of the people that were conquered. They had to work, produce certain goods, and give part of those goods or part of the profit from those goods to the governing bodies.