Final answer:
Relief sculpture was introduced to the United States through European influences, including the inspiration from ancient Greek sculptures, leading to the establishment of the first American school of sculpture.
Explanation:
Relief sculpture was first introduced to the United States through the work of artists influenced by European styles. One significant example is the creation of the Lion Gate relief sculpture in ancient Greece, which served as an inspiration for American sculptors. These early sculptures paved the way for the development of the first American school of sculpture in the 19th century.
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