The most quintessentially American hotels, in honor of America's 250th birthday.The entrance of the Ocean House in Westerly, Rhode Island.Credit: Ocean HouseTravel + Leisure's July issue is dedicated entirely to domestic travel, in celebration of America's 250th anniversary. With this in mind, T+L editors weighed in on some of the most classically American hotels in the country, some historic, others known for creating American staples, and stil…