The states still had the freedom to create their own laws and have their own constitutions (as long as they don't go against by the Constitution). The states have reserved powers.
The rights of the individuals are respected mainly by being listed in the constitution's first ten amendments, or Bill of Rights.
The government created at the Constitutional Convention was similar in respect to the jurisdiction states obtained, branches of government (Judicial, Executive, Legislative). These were put in place to balance one another, they also added the concept of elections to be carried out to select government representatives. Furthermore, the adoption of Naturalization, and the ability to create more states. Hope that helps you...
Answer:
A few things connect Ibn Battuta, Marco Polo, and Zheng He, even though their lives did not overlap. They each served kings and emperors. They each traveled enormous distances to places most people from their homelands had never seen.