It could be really interesting. Maybe Harry would grow up with a different kind of magic education system in America. He might attend Ilvermorny instead of Hogwarts. His friends could be American witches and wizards with different cultural backgrounds and accents.
The plot could change a great deal. For one, the threat of Voldemort might not be as immediate or known in the same way. Harry could be dealing with different dark forces in America, like some ancient and malevolent American - based dark wizards. His journey to discover his past and his power would likely take different turns as he navigates the American wizarding world.
The story would be completely different. Harry would probably have a very different personality. Instead of the somewhat shy and uncertain Harry we know, he could be more confident and assertive like Captain America. His magical abilities might be used in a more strategic way, similar to how Steve uses his combat skills. And the wizarding world would have to deal with a Harry who has a very different upbringing and set of beliefs.
Well, in a 'Harry Potter raised in America' fanfic, the cultural differences would play a huge role. For example, the magical community in America might be more open to new forms of magic or technology. Harry could be involved in things like American wizarding sports which are different from Quidditch. Also, the way magic is taught in American schools could be more hands - on or practical - oriented.
Harry would be a more confident and brave individual. Captain America's influence would make him less afraid of challenges. In the wizarding world, he would approach his studies and the fight against dark magic with more determination. He would also be more respectful of authority, but not blindly so. If he saw something wrong with the wizarding authorities, he would try to change it in a more diplomatic way, learned from Steve's leadership.
In many Harry Potter fanfictions, the concept of being 'raised by darkness' can take various forms. It might involve a character being brought up in an environment influenced by dark magic or dark wizards. For example, a character could be raised in a family that secretly practices the Dark Arts. This could lead to the character having a different moral compass compared to those raised in the light. They may struggle with the line between right and wrong, as their upbringing has exposed them to unethical magical practices.
One possible fanfiction could be about Harry Potter visiting America and encountering a new form of dark magic related to death. Maybe he goes to a haunted place in America, like an old plantation, and has to deal with a death - based curse.
In the original, the story is deeply rooted in British wizarding culture. But in a 'Harry Potter raised in America' fanfic, the plot could involve different historical events and magical artifacts specific to America. For example, instead of the Philosopher's Stone, it could be some American - made magical item. Also, the role of the Ministry of Magic in America might be different, which would change the power dynamics and how Harry interacts with the magical authorities.
Harry might meet some American wizarding families that have long - standing traditions different from the pure - blood families in the UK. These families could introduce Harry to new forms of magic and social norms within the American wizarding community. He could also meet American Muggle - born wizards who have their own unique stories of discovering magic in a different cultural context compared to what he's used to.