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United States

In the new republic, Robert Adam 's neoclassical manner was adapted for the local late 18th- and early 19th-century style, called Federal architecture. One of the pioneers of this style was the English-born Benjamin Henry Latrobe, who is often noted as one of America's first formally trained professional architects and the father of American architecture. The Baltimore Basilica, the first Roman Catholic cathedral in the United States, is considered by many experts to be Latrobe's masterpiece.

Another notable American architect who is identified with Federal architecture was Thomas Jefferson. He was very interested in the building he saw in Paris when he served there as ambassador, and built several neoclassical buildings, with his own innovations, including his personal estate Monticello, the Virginia State Capitol, and the University of Virginia.

A second neoclassical manner found in the United States during the 19th century was called Greek Revival architecture. It differs from Federal architecture as it strictly follows the Greek idiom, however it was used to describe all buildings of the Neoclassicism period that display classical orders.