What motivated early American lawmakers to organize the legal system on almost two parallel systems?

Early American lawmakers were motivated to organize the legal system into two parallel systems—federal and state—primarily to balance power and address the diverse needs of different regions and populations. This structure allowed for local governance tailored to specific community values and circumstances while maintaining a unified national framework. Additionally, the federal system was designed to prevent the concentration of power and protect individual liberties, reflecting the principles established in the Constitution. This dual approach aimed to ensure both effective governance and the protection of rights.