Because of that city's location on trade routes to Asia and the Middle East.
Answer:
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The column of Trajan features the type of art known as
narrative relief.
This means that it is a relief that tells a certain story. A relief is a sculpture, usually, which sculpted parts are attached to a solid background, and they are raised above it. Trajan's column is located in Italy, and tells the story of the Roman emperor Trajan's victory in the Dacian wars.
Clement Greenberg was an art critic and collector who advocated for a formalist aesthetic. He was best known as an early champion of Abstract Expressionism.