By European travelers going to the tip of Africa and then coming back across the sea to America and the slaves were bought by colonists.
The ghazu were military expeditions or raids and after the emergence of Islam meant religious warfare. Ummah is a word from the Arabic language which means nation or community. It is commonly used to describe the collective community of people who practice the religion of Islam.
The Egyptians believed that when they were.mumified their bodies were bing prepared for the afterlife. The afterlife was essentially the belief that they would continue their journey elsewhere, aka the afterlife.