Explain how democracy evolved in ancient greece from earlier forms of government in greece?

In the year 507 B.C., the Athenian leader Cleisthenes introduced a system of political reforms that he called demokratia, or “rule by the people. ... Although this Atheniandemocracy would survive for only two centuries, Cleisthenes' invention was one ofancient Greece's most enduring contributions to the modern world.

Race, for example, the chinese exclusion act