Which nation was the first secular nation in the history?
This is a difficult question to answer, as it depends entirely on your definition of the term secular state. The first nation to expressly identify itself as a secular state was the United States in the 18th century, although many empires have expressed their emphasis on religious freedoms since the beginning of human civilization. In the Mongol Empire, people were given total freedom as to what religion they followed and people were never persecuted for their beliefs as long as it did not affect any other religion’s practices. The Persian Empire was similar and had no state religion but instead gave its people the freedom to choose their own faith. In all it is difficult to say what was the first secular state, but the first secular state in the modern interpretation is the United States.