1(Avengers)

An Au where Loki and maybe a few others that did not agree with Thor being crowned king left Asgard the day Loki approached the Frost Giants in canon.

They travelled between different realms and learnt the stories they have been told since they were children from the eyes of the other realms(including Jotunheim because Loki deserves to know his true origin and that like Frost Giants were the monsters for the Aesir, the Aesir are the monsters for the Frost Giants).

Some decides to stay behind in some of the realms they visited but others followed Loki to all realms and decided to stay with Loki when he thought Midgard would be the best place for him to reside and create a new life in.

And that's how the Yggdrasil Publishing Company started in America, Loki and the Aesirs decides to share the stories of their realms while keeping in mind what they learnt about every realm plus some opened a small defence school where they taught others to defend themselves.

How this would affect anything else, possible ships, if SHIELD and HYDRA know about the truth, etc is up to the writer