Music is created on what stage the culture is in. In the 60's and 70's you never herd a song about the things you hear today
All of the choices given were invented before 1840 except for the zipper. The zipper was invented in 189. The correct answer is B.
The president must have been born in the United States, he or she must be at least 35 upon taking office and must have spent at least 14 of these years living within the United States. The farmers specified theses requirements to ensure that the president would be a solid U.S citizen, without loyalties to another nation, and would bring years of life experience to the office.
The united states constitution is called the living document because it was created with the purpose of being able to grow and change (just like a living thing) with the changing needs of the country.