Exactly what it says on the tin. I'll start: the Dutch Republic loses the Franco-Dutch War early on, i.e. somewhere during 1672. The result is that all of the Dutch Republic is annexed by France, except for the County of Holland. At the risk of somebody mentioning that this puppet would later be annexed by France down the line, another option would be Dutch Limburg and Zeelandic Flanders becoming part of Belgium after the Belgian Revolution. That's my take on my home country. How would you go about doing the same to yours?