What is the theme in Iberia: Spanish Travels and Reflections by James A. Michener?

The power of the church is another theme. Spain is undeniably a Catholic country. When Isabel and Fernando ruled this notion became solidified. Isabel the Catholic wanted to make sure that her nation was a unified Christian nation and is a reason why she expelled the Jews and the Moors. It was a very sad thing that she did this. There aren't many places in the world that are tolerant of more than one religion in the same area, especially in homogenous societies. As a result of solidifying Spain as a Catholic nation, a certain fear evolved of everything that was different. This paranoia led to the Spanish Inquisition, which is the most notorious Inquisition in history.