United states is nearing London is 3,150 miles from London.
Very very few wizards from this country end up in Hogwarts. Most who do have some sort of Wizard relative in United Kingdom that care for them.
United states has 50 states that a character can visit and have fun. Please do research on where you character is going. It is fine to go a little crazy.
Top 5 cities will be in boards here. Remember there is flying cars in united States these days. So if you flying on a broom or bird WATCH OUT! The flying cars are mostly seen in rich areas.
