What ONE idea that came out of the Enlightenment period had a major impact on the politics-nations of the modern world?

Following ideas from the Enlightenment that you believe had the most impact on the modern world:

Question: What ONE idea that came out of the Enlightenment period had a major impact on the politics and nations of the modern world?
Instructions:
A. Select ONE of the following ideas from the Enlightenment that you believe had the most impact on the modern world:
• Natural Rights
• Social Contract
• Separation Powers
• Separation of church and government
B. Conduct research and collect evidence about your topic. You will need to:
• define the major political idea you chose
• trace its development and use in the modern world.
• provide evidence that demonstrates why this idea is so important to the modern world.
• use evidence from at least two sources such as journals, news websites, legal documents, or articles.
C. Write your paper using your research. Remember, your paper needs to answer the following question: What ONE idea that came out of the Enlightenment period had a major impact on the politics and nations of the modern world?