Why 1807 significant
The members of the Society for the Abolition of the Slave Trade decided to concentrate on a campaign to persuade Parliament to prohibit the trading in slaves, for tactical reasons. They felt they were more likely to succeed, than if they demanded the abolition of slavery itself throughout the empire.
Why 1833 significant
The British Parliament passes the Slavery Abolition Act 1833, ultimately giving slaves in much of the British Empire their freedom (enacted 1834).
Credicts to the owner
Some groups in South America continued to live as nomads after the development of agriculture because their traditions and knowledge were very important and they didn't want to lose them. They wanted to preserve their lifestyle and values.
Nomads are people who live in communities that move from place to place, instead of settling down in only one location. There are three different types of nomads: pastoral nomads, hunter-gatherers, and peripatetic nomads.
#1 is brit milah
#2 is Yom Kippur