Answer:
The threat of the grwoing power of Nazis
Explanation:
A. Leaders believed the monarchs could help prevent any one ruler from taking too much power.
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The correct answer to fill in the blank is the Calvinist(Huguenots)
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Roman concrete is very similar to what we use today. It was used to build structures and many buildings. It was revolutionary at the time as not many things were made of something such a concrete. The Romans proved to be much more advanced than other people and a leader in the world at the time.