State and Federal Legal Systems Discussion

Explain why there are two types of legal systems in the United States: State and Federal systems. How are they similar and how are they different? (Minimum of 500 words with 2 peer reviewed reference in-text citations in an APA format)What powers and responsibilities do both federal and state systems share? (Minimum of 300 words with 2 peer reviewed reference in-text citations in an APA format)