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.
On-the-job training is the most common route to becoming a general office clerk. Most on-the-job training typically lasts one month or less. General office clerks are trained in areas such as using office equipment and computer software programs, depending on the responsibilities of their particular positions.