The unified story of humankind that long dominated how people thought of the past, present, and future is known as

Grand narrative.

Explanation:

As the exercise briefly states, the unified story of humankind that long dominated how people thought of the past, present, and future is known as grand narrative. This grand narrative is a post-modern thesis about meta narratives, which brought skepticism given that constructing grand theories leaves out the picture the natural and existing chaos and disorder of the individual event.

express a consistent, unwavering viewpoint

Explanation:

Mark is a Democrat. He just joined a Welfare Reform Committee made up of nine Republicans. Mark holds a minority opinion on this issue. If Mark wants his opinion to influence the group’s final recommendations, he should EXPRESS A CONSISTENT, UNWAVERING VIEWPOINT