What country were tens of thousands of people killed as its president attempted to stay in power?

Tens of thousands of people were killed in Syria as President Bashar al-Assad attempted to maintain his grip on power during the Syrian Civil War, which began in 2011. The conflict escalated from peaceful protests against his regime into a brutal civil war, involving various factions and international interventions. The government's violent crackdown on dissent, including widespread use of force, led to significant loss of life and a humanitarian crisis.