Why aren’t some Usborne fiction books available to buy in the United States?

The majority of Usborne books are written and designed by our in-house team, at our offices in the UK. However, our fiction range is acquired from authors via literary agents. This is a more traditional publishing model, and one which can often lead to rights restrictions - if we are not able to buy US publishing rights from authors' agents, we are not able to distribute those books in the USA.