What significant feature was added to the Capitol during the 1851 extension?

The addition of new wings to the Capitol during the 1851 extension was a pivotal development in the building's evolution. This expansion aimed to accommodate the growing needs of the legislative branches as the United States was expanding both geographically and in population.

The original structure of the Capitol was not sufficient to house the increasing number of representatives and the additional functionalities required with the government's evolution. By adding the new wings, which were designed in line with the architectural style of the existing building, the Capitol could effectively support more legislative activities and provide space for additional offices.

This modification not only enhanced the functional capacity of the Capitol but also contributed to its aesthetic appeal, creating a more balanced and unified appearance that is recognized today. The completion of the wings helped solidify the Capitol's role as the central hub of American democracy.