Hi! I'm new around here and i've got a suggestions for 2 timelines
What if John II of Portugal accepts Christopher Columbus proposal to a expedition to the Americas
What if Alfred the Great died in Chippenham ?
GO with Alfred
There is a very good reason that Portugal didn't fund Columbus, namely that they knew what they were talking about, and Columbus didn't. The Indies were not, no way, no how, reachable with Columbus's proposed ships. Now, as it happens, the Americas were in the way, and Spain got a huge empire, but the initial proposal involved Columbus and Spain not understanding geography.