What was the combined effect of both the universal declaration of human rights and the nuremberg trials?

They established international humanitarian law.

Explanation:

The Universal Declaration of Human Rights is a document that consists of 30 articles that discuss the individual rights of all people. This document was adopted by the United Nations in 1948, and is considered one of the most important documents in history. On the other hand, the Nuremberg Trials were a series of military tribunals that were held in order to prosecute prominent members of the Nazi Party. Both of these events contributed to the establishment of international humanitarian law.

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