1800: Completion of first White House Federal style heavily influenced by Georgian architecture.
1803: Louisiana purchase. America's territory expands past the Mississippi River. Westward immigration begins in earnest.
1812 — 1815: War of 1812. The war marks a shift from America's dependence on English trade and architectural forms. Adamesque architecture wanes in popularity after the war.
1814: British forces burn the first White House and much of Washington DC.
1825: Erie Canal is completed, speeding the immigration of European settlers into the western territories.
1830: United States Capitol completed. The Greek Revival building is the model for many later public buildings, prompting the style to become known as the "National" Style.
1837: City of Chicago incorporated. By 1860 it has become the largest city in the region and the center of America's growing industrialization.
1861—1865: US Civil War. The war marks the end of the popularity of Federal architecture. Much of the historical architecture of the Southern states is destroyed during the war.
Federal Era buildings predominated post-colonial America, from the creation of the U.S. Constitution to the start of the Civil War. Most civil government buildings were Federal in design, and Federalist houses were very popular throughout the American settlements, especially in New England.
Architecture of the American Federal Era embraced the optimism and boldness of the growing nation, and marked a gradual trend toward the unification of forms between the regions. A more harmonized pattern of national architecture was beginning to emerge.
Adam Shortly after the adoption of the U.S. Constitution, the Federal, or Adam, style became widely popular throughout the newly unified country. Based on the designs of British architect Robert Adam, this style incorporates many features found in Georgian homes, such as cornices with tooth-like dentils or other decorative molding and double-hung windows with six panes in each sash. Additionally, they often incorporate an elliptical fanlight over the front door, with side lights and decorative crowns as ornamentation.