New Valhalla

"In this version of history, the Vikings stayed and conquered all of North America, or as it's called now, New Valhalla."

- Gideon

New Valhalla was an aberration caused by the anachronism related to a Beebo toy, which ended up in 1000 AD's Vinland, carried by young Martin Stein. The project was hijacked by Damien Darhk, disguised as Odin, but ultimately averted through the efforts of the Legends.

Aberration timelines
Worshiping Beebo as the God of War, the Vikings under Freydís and Leif Eriksson started the conquest of America despite the warnings from Christian priests. Successful in their conquest, they covered all of Vinland and beyond, creating the realm of New Valhalla, which became so influential that it had "Beebo Day" supersede Christmas and Yuletide as the prime winter solstice holiday. In another aberration, Beebo was destroyed, but now Damien Darhk hijacked the viking colonists and continued the conquest, resulting in him propagating "Odin's Day" as the new winter solstice celebration.

Current timeline
Due to the efforts of the Legends, Beebo "informed" the vikings that Jesus Christ is the one true God, but that doesn't mean science and evolution aren't real. This, along with Damien Darhk's escape, influenced Leif Eriksson to abandon the New Valhalla plans and return back to Scandinavia.

Trivia

 * This is the third aberration country created due to time travelers on the lands of the United States, the previous ones being Turnbull Country and Magna Hesperia.