With a POD of 1492, arrive in the 21st century with a United Kingdoms consisting not only of Britain, but a large portion of North America as part of its' nation.
Bonus: This nation includes roughly OTL US up to the 13 colonies.
Extra Bonus: Includes OTL US as far as the Mississippi River.
Max Bonus: Includes OTL US to the Pacific(Alaska is not required).