Why did americans try to create a republic in which the states have more power than the central government

The founding fathers wanted a democracy like the Greeks. The founding fathers were also inspired by the Romans ( that’s why we have a president, senate, etc.). To get to the point it’s because they didn’t want the government to be powerful over the people. This is why we have a 2nd amendment. People don’t know this but the 2nd amendment is so we can make a militia if the government became tyrannical. People also don’t like free speech which is an important amendment that has gotten us far. Taking these amendments away is actually now giving power to the government.

Where’s the diagrams?