In 451 or 450 Pericles carried a law confining Athenian citizenship to those of Athenian parentage on both sides. No source provides any background to this proposal; it is not even clear whether it was retrospective.
A high school diploma or GED is enough to get started as an office clerk. It is important to have some office skills, such as typing, good phone skills, word processing, etc. Most training is done on the job.
Although most accounts payable clerks have a high school diploma or the equivalent, possessing an associate's degree may increase the number of jobs for which an individual is eligible. An associate's degree in accounting can prepare individuals for a job in the field.