The Constitution created the 3 branches of government:
To ensure the government is effective and citizens’ rights are protected, each branch has its own powers and responsibilities, including working with the other branches.
(Text from https://www.usa.gov/branches-of-government)
The following represent just a few of the books in the University Library on the separation of powers within the U.S. government. Search the Library Catalog to find additional books.
Separation of powers : documents and commentary by 
The separation of powers doctrine : rationale, applications and bibliography / by 
Separate but equal branches : Congress and the presidency by 
