James II going down fighting is certainly an important aspect of this WI. The OP is about James II fighting rather than fleeing but not necessarily winning.
If Williams wins after a hard fight, it would certainly change things a lot I would think.
During the Reformation, many rulers decided to abandon their affiliation with the Roman Catholic Church (RCC) and instead embraced Protestantism. But what if Reformers decided to call for switching to Orthodoxism rather than Protestantism?
Many of the rulers were attracted to Protestantism...
Williams wasn't another Cromwell. He was the grandson of Charles I and married the eldest child of King James II. So he and Mary had a strong claim to the throne.
If he fought, defeated, and killed James II, he would be more like another Henry VII who also fought and killed a King.
The problem...
When Operation Barbarossa was launched, it was clear that Germany did not have knowledge of the full extent of Soviet military capabilities.
During the initial stages, Germany was tremendously successful. They captured or killed millions of troops and occupied much of European Soviet Union. But...
Kings have been killed all the time. It wasn't that long ago when his father Charles I was killed after all. Then you have Richard III and Henry VI.
If James II just stayed in London, he gets imprisoned and suffers the date of his father Charles I. I don't see how it would be an issue at all.
James II had a son named James Francis Edward Stuart (JFES). As the oldest legitimate male heir, he was theoretically first in line over his sisters. But being Catholic he couldn't ascend the throne.
JFES died in 1766. Before his death, William & Mary, Anne, George I,II,III ascended the throne...
WI Turkish War of Independence is lost?
Do Turks still get a nation and if so how small? Republic of Kurdistan forms? What about other border changes and the wider impact to the Middle East and the world?
IOTL, Japan was able to conquer almost all of China. From 1937 all the way to the end of the WWII, Japan held the initiative and continued making gains. Only war with the USA prevented Japan from total victory in China.
But what if Chinese forces performed much better and was actually able to...
IOTL, the dominant Roman Catholic Church's power and holdings was broken up by the Protestant Reformation.
Instead of a movement to reform Christianity, perhaps some kind of Atheist Martin Luther comes about and says that Christianity is all made up bunk like Paganism before it? And then rulers...
With a PoD of 380CE (after Christianity became the state religion of the Roman Empire), how plausible and how early could a Deist or Atheist Revolution take place in Europe?
The council-manager system is nothing like running a govt like a business. All the councilman are still elected officials including the mayor. They make executive and policy decisions and are nothing like a board of directors in a corp whose only role is occasional oversight but otherwise gives...
The purpose of business is profit for the top shareholders, including top management. Care of workers, consumers, environment are just means to that end not ends in and of themselves. These are things to be exploited and cost contained.
Workers get too uppity or expensive? Fire them or...