The blame was the industry that took their land
The 1900s was more industrialized as a result of the industrial revolution, and there were a number of social reforms, such as suffrage for people of color and women. The 1900s also saw an end to traditional monarchy as a result of the 1917 Russian Revolution.
The answer is D] it helped to unify africans their colonial situation
Demographers are scientists who study human populations. They tend to map and understand the dynamics of population, which includes birth, death, and migration. All of these affects population and must be studied by demographers. They may study the population change within a country or the interrelationship of countries' populations, which is mostly necessary in studying migration. However, they could also take specialization. For example, they could study only parts of the population like workers' social pattern. Demographers mainly use statistics in mapping their data.
The answer to your question is,
a tag question.
-Mabel <3