Why did the need for expanding education increase due to immigration?

How do conflict minerals, and in particular, conflict coltan get their name? what groups benefited from the trade in conflict minerals? what group were hurt by it?

Which factor was a major cause of the great depression of the 1930?

This pie chart shows statistics related to the world's population. a pie chart like this one is most for making predictions about the future. showing how parts make up a whole. presenting amounts over a period of time. comparing information from different sources.