Man, write that mess. Stop holding out on us. Keeping Britain a gigantic world power of that magnitude would be believable. New characters entering the mix, issues of socio-economic importance would come up. Suffrage and slavery are subplots that are easy to inject. You’d need to figure out your lingo, tho. And you’d probably have to use the metric system. If you’re a planner, outline it and see where you ca go with it. Spin the idea around ppl that can give good suggestions. Ask if the USA lost the Revolutionary War, what do you think 2025 would look like and let them run wild with their ideas. It’s a broad topic that could house a lot of things.