Final answer:
Cleisthenes tried to reform Athens by canceling debts and giving the right to vote to all Athenian citizens. He established the first real democracy in Athens by allowing all male citizens to have a vote in public matters and be eligible to serve in public office.
Step-by-step explanation:
The Athenian leader who tried to reform Athens by canceling debts and giving the right to vote to all Athenian citizens was Cleisthenes. In 508 BCE, Cleisthenes took the radical step of allowing all male citizens to have a vote in public matters and be eligible to serve in public office, making Athens the first real democracy in history. He reorganized the Athenians into ten new tribes, mixing men of different backgrounds together to unite them politically.