"Why boarding OP? Most Americans are fairly against it so I'm surprised to see that's your first thought."
Not only are most Americans fairly against it, but it's reasonable to say most British are fairly against it too. In fact, most of the world is fairly against it. Boarding schools are essentially a British phenomenon. The British were the pioneers of this concept in the modern era but historically the idea goes back many centuries. Eton, for example, was founded in 1440 where the scholars had (and still have) to study and live at the school. It is not surprising, therefore, the rest of the world were not used to this concept - they would be extremely lucky to have any school of any kind at all, never mind boarding schools. But the idea soon caught on in the 19th century especially in other British Commonwealth countries and/or colonies where Britain had her empire - largely due to British civil servants who were sent there to rule over the natives.
But boarding schools were, rightly or wrongly, given a bad name for a long time until the early 1970s for a number of reasons or a combination of reasons, e.g. the bullying culture, the state of their accommodation, the stale food, and even the abuses committed by the adults on their charges, to name but a few examples.
However, boarding schools have reinvented themselves in the last 30 or so years. With the emergence of stringent rules and regulations governing adults' association with children in particular, and the rights of parents and children in general, the modern day boarding school is a complete transformation from its past ghosts! In many of the top-tier boarding schools of today, their standard of accommodation and food can seriously embarrass those of a 3 or 4-star hotel's!
As for the Americans, the only British school they know of is - yes, you guessed it - Eton! No other British school matters to them. Eton has always had a "special relationship" with America. In fact, there have always been American boys boarding at Eton for as long as I can remember. from almost 80 years ago (1942) gives a little idea to this relationship. And I've personally assisted some American families with their sons' application to Eton and helped when they began boarding here. As a matter of fact, there is an organisation called,'The American Friends of Eton College' (AFEC) based in the USA to promote goodwill and friendship between Americans and The School.