William Frederick, son of the last stadtholder, returned to the Netherlands in 1813 and proclaimed himself Sovereign Prince of the Netherlands. Complete the following sentence: William Frederick, son of the last stadtholder, returned to the Netherlands in 1813 and proclaimed himself Sovereign Prince of the Netherlands. Two years later, the Congress of Vienna added the southern Netherlands to the north to create a strong country on the northern border of France.<unk> Two years later, the Congress of Vienna added the southern Netherlands to the north to create a strong country on the northern border of France. William Frederick raised this United Netherlands to the status of a kingdom and proclaimed himself as King William I in 1815. In addition, William became hereditary Grand Duke of Luxembourg in exchange for his German possessions.<unk> In addition, William became hereditary Grand Duke of Luxembourg in exchange for his German possessions. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️
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