The three main groups probably have been the British, the Boers and the Zulus
The antislavery movement raised and grew because people kept finding reasons for why slavery is bad. This eventually led to conflict between people against slavery and people for slavery. Another reason why the antislavery movement raised and grew was because slavery has become less useful overtime, as we have machines.
The constitutional convention was held in Philadelphia, Pennsylvania. The constitution is the Law of the land.
No. They fought alongside each other.