The Union League of Philadelphia is more than just a building; it is a prestigious private club with a rich history, founded in 1862. Originally established as a patriotic society to support the policies of President Abraham Lincoln, it is the oldest surviving "loyalty league" in the USA. The club's motto, "Amor Patriae Ducit" or "Love of Country Leads," speaks eloquently of its founding principles and makes it a landmark historical site.

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Located in the heart of Philadelphia, the club building itself is an architectural landmark. Its impressive brick and sandstone facade is designed in the Second Empire style. The original design was created by John Fraser and completed in May 1865, witnessing significant historical events and becoming an essential part of the city skyline.
Over time, the Union League expanded, reflecting its growing status. In 1905, the famous Philadelphia architect and league member Horace Trumbauer won a competition to design significant additions to the building. These extensions, executed in the elegant Beaux-Arts style and completed in 1910 and 1911, expanded the building to the size of an entire city block, turning it into one of the city's most imposing and recognizable structures.