self-designed major, how to explain?

I have the option of designing a major which I would like to do but I have to be able to explain it.

It would consists of a certificate of public health, a certificate of non-profit management, along with multiple political science, history, and psychology classes. I would get more out of this self-designed major than I would a traditional major as with the non-profit management aspect I would be learning about grant writing and so forth and it's less focused on one aspect although public health, non-profit management , political science and psychology all suggest that I would likely either be looking to work for the government in some aspect or at a non-profit organization attempting to improve the lives of people or further studying people in graduate work.

This would be at the University of Iowa uiowa.edu