Why did alliances develop in europe prior to world war 1

Using the chart below for reference, how would you describe the relationship between the amount of education you receive and the amount of money you make?

The people of are overwhelmingly arab but are divided by religion.

Why does c. wright mills identify critical thinking as one of the most important criteria for the development of intellectual craftsmanship? why is constantly being aware of the biased nature of your reactions and interactions (what c. wright mills calls self-reflexive) key to the development of that critical thinking? finally, why is keeping a file important, how can it lean to intellectual curiosity which can foster critical thinking and to develop a keen analytical mind?