How did the slave trade affect africa?

a: the african states united to protect their populations from the invading slave traders.
b: africa's population stopped growing in 1400 and began to decline in 1600.
c: several african states became increasingly dependent on the trade for european goods.
d: european and arab slave traders eventually went to war for exclusive rights to the slave trade.

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.

1and 3 i think sorry if wrong