What was the result of the revival of the civil service system during the tang dynasty?

There were smarter, more qualified people working for the government which lead to a stable government.

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.