What causes of international conflicts existed in the 16th century?

For a long time in Europe, there were two points of view on the political structure. The first point of view belonged to the Habsburg dynasty ruling in the Austrian Empire, whose representatives believed that all European states should unite under their rule. England and France adhered to a different point of view, who believed that independent independent states should exist in Europe.
In the XVI century. Europe was split along religious lines. The Reformation and the Counter-Reformation that began in response to it led to religious wars, in which Protestants and Catholics from all over Europe participated.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.