Final answer:
The most controversial act of the National Assembly that led to the Vendee civil war was the Civil Constitution of the Clergy.
Step-by-step explanation:
The most controversial and divisive act of the National Assembly that contributed to the outbreak of civil war in the Vendee was the Civil Constitution of the Clergy. This act, passed in 1790, aimed to bring the Catholic Church under state control by reforming the organization and powers of the clergy. It required all clergy to swear an oath of loyalty to the state, which many refused to do, leading to a violent resistance in the Vendee region of France.
The Civil Constitution of the Clergy caused significant unrest among the clergy and the Catholic population in France, who saw it as a violation of their religious liberties and an attack on the Church. In the predominantly Catholic Vendee, this act was met with staunch opposition, leading to a full-scale rebellion against the revolutionary government.
The Vendee rebellion, also known as the War in the Vendee, was a brutal and violent conflict that lasted from 1793 to 1796. The rebels, known as the Vendeeans, fought against the revolutionary forces, seeking to defend their religious beliefs, local autonomy, and traditional way of life.