The last question is correct: <span>The Nile's flooding was reliable and came at about the same time every year. </span>
Famine is yes a pull factor in cases of needing to go to war but what are you asking exactly?
Apartheid was the old social system where racial discrimination is prevalent. This is the system that give a separate treatment for white people and black people including those who are belong to other races.
Back in the 1800s nobody cared at all until around the 1940s where people noticed there were too many people coming in 2000s immigration is illegal unless with paperwork