18.In the early 1900’s, Roy Harris created and promoted a distinctly American style of classical music and greatly influenced a number of composer in the United States.
19.The eighteenth century witnessed the emergence of North American ports, particular Boston, New York, and Philadelphia, as major commercial centers within the
The eighteenth century witnessed the emergence of North American ports, particular Boston, New York, and Philadelphia, as (it witnessed) major commercial centers within the British empire.