People in a caravan are glad to see an oasis, because they usually traveled in deserts. There are limited amount of water located in a desert, and animals and humans cannot survive without water. Whenever they see a oasis, they are happy, because not only does it supply them with water, but it may also draw game (animals that could be eaten) to that area, which provides both water and food
hope this helps
He was the first black President of South Africa, he spent 27 years for trying to overthrow the pro-apartheid government. After he got out of prison, he worked to achieve human rights and a better place for the people of South Africa.
A need for an established government in order to maintain peace. A government is able to implement laws and taxes.