White House has quality built using slave labor
Construction
Construction of the White House began at noon on October 13, 1792, with the laying of the cornerstone. The main residence and foundations of the house were built largely by both enslaved and free African-American laborers, and employed Europeans. Much of the other work on the house was done by immigrants, many of whom had not yet obtained citizenship, including the sandstone walls, which were erected by Scottish immigrants, the high-relief rose, and garland decorations above the north entrance and the fish scale pattern beneath the pediments of the window hoods. 
There are conflicting claims as to where the sandstone used in the construction of the White House originated. Some reports suggest sandstone from the Croatian island of Brač, specifically the Pučišća quarry whose stone was used to build the ancient Diocletian's Palace in Split, was used in the building's original construction. However, researchers believe limestone from the island was used in the 1902 renovations and not the original construction. Others suggest the original sandstone simply came from Aquia Creek in Stafford County, Virginia, since importation of the stone at the time would have proved too costly. The initial construction took place over a period of eight years at a reported cost of $232,371.83 (equivalent to $3,710,000 in 2021). Although not yet completed, the White House was ready for occupancy circa November 1, 1800.Due in part to material and labor shortages, Pierre Charles L'Enfant's plan for a grand palace was five times larger than the house that was eventually built. The finished structure contained only two main floors instead of the planned three, and a less costly brick served as a lining for the stone façades. When construction was finished, the porous sandstone walls were whitewashed with a mixture of lime, rice glue, casein, and lead, giving the house its familiar color and name.
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