At first the Earth Alliance was motivated only by a desire to establish a reputation for themselves as a major player in galactic affairs.

Mars is a human colony seeking independence from the Earth Alliance, which it eventually achieves.

This led to Clark declaring martial law throughout the Earth Alliance.

This included joining the Earth Alliance military and working for private organizations.

Over the next year and a half he slowly turned the Earth Alliance from a democracy into a dictatorship.

She eventually began to get into trouble with the Earth Alliance for breaking rules.

Or was this where she belonged - with her peers, in the midst of important decisions that affected the entire Earth Alliance?

Marines - the ground forces of the Earth Alliance.

The Earth Alliance is a representative liberal democracy for most of the series.

After making first contact with the Centauri, the Earth Alliance saw massive growth.