Final answer:
The Irish revolution led by the Volunteer Movement ended quickly due to the British military's swift response, which resulted in the revolutionaries' surrender and subsequent punitive measures, culminating in the setup of the Irish Free State in 1922 post the Anglo-Irish Treaty.
Step-by-step explanation:
The nascent Irish revolution led by the Volunteer Movement ended quickly primarily because of the swift and overwhelming military response by the British. The Easter Rising of 1916, a key event during this period, saw Irish nationalists seizing key buildings in Dublin and declaring the establishment of the Irish Republic. However, the British responded with significant military force, leading to the surrender of the revolutionaries who were met with harsh punishments, including executions.
This military response and the execution of leaders of the Volunteer Movement undeniably dampened the immediate revolutionary spirit, but it also stirred a surge of support for Irish nationalism, eventually leading to the creation of the Irish Free State in 1922 following the Anglo-Irish Treaty, which ended the Irish War of Independence started by the Irish Republican Army (IRA) against British rule.