I have been thinking a bit about the potential of the so-called
United Kingdom of the Netherlands, that incarnation of the Dutch state created after the Congress of Vienna in 1815 that included what are now the sovereign states of Belgium and Luxembourg within itself, the course of 19th century history would have been altered.
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Consider: Containing within itself the maritime and trading strength of Holland and the growing industrial economy of Wallonia, with a still-substantial overseas empire, the 1815-1830 Kingdom of the Netherlands arguably was close to becoming another European Great Power. The corner of northwestern Europe near the mouth of the Rhine, rather than being a cockpit for rival powers, might itself become a seat of power. It certainly could have been a very risky move for France to try to seek territorial acquisitions in the south of this country as compensation for the gains of its rivals.
Mind, this all depends on whether the United Netherlands could have survived. Was the Belgian Revolution inevitable? Was it possible that the Dutch state might have bent enough to make the break less possible? Alternatively, was it possible that the Belgians might have had less foreign support? Beyond that, even if the United Netherlands did survive, would its divisions be manageable politically? A United Netherlands could end up lurching from one crisis to another, a sort of Austria-Hungary on the North Sea.
Thoughts?
The Belgian revolt was certainly inevitable. The policies of Willem I did antagonize the Clergy and the Liberals and drove these political oponest towards each other. Never the less not in a way to organize a revolt.
The Belgian revolt was organized almost entirely by agitators, inspired by the July revolt in France with the aim to hand ove rthe Southern Netherlands to France.
Due to the extreme bad handling of the crisses and the civil unrest the Southern Liberals, organized in Brussels, in a civil guard came to the conclusion that it might be better to go for an independent country.
If the revolt in Brussel, was handed better, like it was in Liege, then the revolt would be nothing but a foot note in history.
Let assume the revolt of 1830 came in history books as just the summer riots of 1830. Let assume due to political and economical pressure the division of seats in parliament was shifted to 60-50 in favor of the South instead of 55-55. The next decades the Liberals took power as much happened in Europe during this period.
Industry in Aalst, Gent, Mons, Charleroi, Liege and Maastricht explode. Antwerp as port grew exceptionally. In the North the Haarlemmermeer will be cultivated a bit earlier.
Railroads would be coonecting the entire realm within two decades after 1832.
To compensate the exeptional growth of the port of Antwerp the open sea connection for Rotterdam will be made much earlier than 1870.
Realising that colonies or over seas posessions are valuable markets the Gold coast forts would not be changes with the UK and not be sold later.
Expansion in the Dutch East Indies would be more or less in the same as in OTL. Possible this time the undertakings to get Delagoa Bay ( Mozambique) form Portugal would be more successful in order to get a short trade route to the Boer Republics.
Who knows the United Kingdom of the Netherlands wil participate in the scramble for Africa.
By 1840 or 1850 it would be a self confident industrialized Nation instead of two small nations, one limited by treaties ( Belgium) and one insecure and isolated ( Netherlands).
Major point of trouble would be the opposing views between Liberals, Catholics and (orthodox) Protestants. Possible that the later two find each other in their opposition against the LIberals.
Language is not a real question, but likely the language border will shift to the South in stead to the North. This will happen due since the Dutch language will not be marginalized in the South, it remains an official language and due to migration of people to the factories and mines in the South, not only from Flanders and Brabant but also form Norhtern provinces like Zeeland, Gelre and Overijsel.
Forreign policies is unclear in OTL Belgium is bound by treaties and the Netherlands is to small to make mistakes. This time the economic power is much ore which might create other priorities and interest.