
Michael O. answered 06/23/19
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You're right, you can say, "...the largest, wealthiest, and most beautiful city in British America." By placing and the most beautiful at the end of the sentence, there is an added emphasis on that final adjective, almost as if one were saying, "...and, I might add, the most beautiful." There are different ways of emphasizing parts of a sentence in English. I can say to someone I haven't seen in a while, "I missed you a lot." Compare that to "I missed you...a lot" or "I missed you. A lot." In the latter two instances, the a lot is emphasized.
As for your second query, the "...so much to his liking that he temporarily abandoned...." is similar to a so + adjective + that construction. So, for example, "Adams found the beer so appealing that he temporarily abandoned...."