Yes, it's the Victoria 2 mod, maybe you could play as Beornia (English argentina) and reconquer the british isles, or play as Lusitania (Portuguese texas and a releasable nation from Gran colombia) and conquer portugal+galicia, and yes the mod has a lot of "return home/reconquer lost land" campaigns
Alternated between Beornia and lusitania every decade. By the end of 1935, Lusitania, unable to compete with other arcadian countries for immigrants and industry, fell far behind the industrial might of France, which had taken over protection of Spain. Along with the assimilation of moost of Portugal into Iberia, national rebirth of the homeland is an ever more fleeting goal...
On the other hand, although confined to the southern cone with a smaller population, Beornia managed to reform the monarchy enough to appeal to mass immigration. Industry was expanded by order of the king despite loss of profit in order to prepare the country for future confrontation to reclaim the homeland. This long-term strategy became solidified when French political instability and economic collapse immediately following the pyrrhic victory over Germany and Burgundy in the First Great War. Amidst this chaos, Ireland, Netherlands, and England became independent countries. The Irish were quickly re-absorbed, but England managed to raise armies to protect their borders. Scotland remained loyal to France to keep being protected from England.
Although England had thrown off the yoke of the French state, French elites continued their dominion over the common english folk, and the English republic was run by a dictatorial ethnic Anglois party. English diplomatic isolation raised hopes that Beornia would be able to take the country over from the ethnically foreign overlords.
In 1936, the king quietly assented when the rising fascist party overthrew the elected liberal regime to declare the Britannian Empire.
The Inca, having claimed territories settled by Beornia, first had to be crushed before armies could be sent to Europe. Then, an alliance with France was signed in order to use Scotland as a staging ground for the liberation of the homeland. Although the English had more divisions, their decadent regime had been slow to mobilize the economy for war production, meaning they had no heavy equipment and no manpower reserves. After a few months of brutal pushing through the highlands of northern England, the enemy was ground down under superior firepower, and spearheads broke out from the frontlines, liberating the rest of the country.
France was grateful that the English were destroyed, as their participation in the war meant that Poland and Muscovy would refuse surrender. But with no Great Powers resistingv France, they capitulated to the fascist invaders, While England secured the rest of the South America.
Now, Arcadia and Japan are the only non-fascist major powers, leading various free societies against the growing aggression of France and Italy.