Final answer:
Cleisthenes is the person who divided Athens into neighborhoods or demes and created voting districts as part of his democratic reforms in 508 BCE.
Step-by-step explanation:
The person who divided Athens into neighborhoods, or themes, which became the basis of voting districts was Cleisthenes. In 508 BCE, after being appointed by the Athenian assembly, Cleisthenes implemented reforms to create a more democratic system in Athens.
He reorganized the Athenian citizens into ten new tribes that incorporated villages from various parts of Attica, allowing all male citizens to have a vote in public matters and to be eligible for public office.
Cleisthenes' reforms were a significant step toward developing Athenian democracy, as they encouraged a sense of unity among the citizens and reduced the consolidation of power among the aristocracy.