Any adult male citizen over the age of 20 could take part, and it was a duty to do so. The offices of the democracy were in part elected by the assembly and in large part chosen by lottery in a process called sortition.
10th amendment of the Bill of Rights dealt with limitations of power of federal government while the other amendments deal with liberties and freedom granted to citzens.
I believe they were used to spread Christianity
Actually, the 18th century is the 1700's. Just as we are in the 2000s, we are considered the 21st century.
Four of the five states to first ratify were small states that stood to benefit from a strong national government that could restrain abuses by their larger neighbors.