what type of evidence does Roosevelt used to support the clients of the United nations must retain an analogy on the human rights issue

Commas are used to separate two or more coordinate adjectives. 

Coordinate adjectives are adjectives that work together to describe a noun.

Examples: It was a beautiful, sunny day.
I couldn't see past the dark, gloomy fog.
The clear, blue sky was so effulgent that I could not see.