It is controvertial because it is a flag that is know to be paired with raceism
Answer:
The first mechanical calculator was invented by the French mathematician Blaise Pascal
The answer is actually Complex drainage systems to keep structures from flooding.
Answer:
Vaudeville musical act, the Dixie Duo.
Explanation:
Eubie Blake was an American pianist and Jazz composer. He also went on to work on brodway musicals as the first black writer and director to present a complete musical in the USA. One of his most notable career points was his partnership with Noble Sissle, shortly after the first world war. They wrote some plays and created the musical act of Vaudeville, entitled as Dixie Duo, which was very popular in his time and came to stabilize Blake's name as a great African American artist.
No I don't believe so they are. Here is a link to something that says more on it. I hope this helps!
https://en.wikipedia.org/wiki/Speech_or_Debate_Clause
