the united belgian states). they failed. the austrians returned, and were soon replaced by the french. after the collapse of the napoleonic empire, the vienna congress established the united kingdom of the netherlands, which included both the catholic southern netherlands and the protestant northern netherlands. but the different languages and cultures of the regions led to an uprising in august 1830. the king of the netherlands , willem i, used force. his troops carried out a massacre in brussels, but the rebels won. of course, the great powers also influenced the achievement of independence. all of them, including russia, great britain, austria, france and prussia, agreed to belgium’s withdrawal from the united kingdom of the netherlands and guaranteed the independence and neutrality of the belgian kingdom. in 1910, on the night of october 4, a revolution began that swept away portuguese monarchy. it was constitutional for centuries, but the republicans demanded its complete liquidation, due to economic decline, social inequality, dominance of the church and international failures, the royal power failed to defend the interests of portugal in africa, to unite its colonies of angola and mozambiq