Did the world fairs in the US actually exist as history says?

Q: How could they build these buildings so fast in the era of horse and buggy? A: They hired a lot of people with a lot of hammers. This was a time that preceded income tax. The rich were rich in a way that Elon Musk can only dream of and a bachelor could get by working only two days a week. >State and federal inheritance taxes began after 1900, while the states (but not the federal government) began collecting sales taxes in the 1930s. The United States imposed income taxes briefly during the Civil War and the 1890s. In 1913, the 16th Amendment was ratified, however, the United States Constitution Article 1, Section 9 defines a direct tax. The Sixteenth Amendment to the United States Constitution did not create a new tax. https://en.wikipedia.org/wiki/History_of_taxation_in_the_United_States