You are beyond laughable. 抽出账本中的一张纸，硬说是代表整个账本的，好像这个世界，这样的人还不多。

另外，这是这个话题最权威的发言机构，你要是不满，去找他们去吧。

https://www.whitehousehistory.org/questions/did-slaves-build-the-white-house

“The D.C. commissioners, charged by Congress with building the new city under the direction of the president, initially planned to import workers from Europe to meet their labor needs. However, response to recruitment was dismal and soon they turned to African American—enslaved and free—to provide the bulk of labor that built the White House, the United States Capitol, and other early government buildings.