[Solved] What was especially unique about the "Era of Good Feeling"? A)Political parties were banned. B)President Monroe ran unopposed in 1820. C)Jefferson's faction adopted the label "Republican." D)The president and vice president were from competing parties. E)Federalists won the election of 1820. Chemical: A substance that undergoes a chemical reaction, consisting of atoms or molecules. Mechanical: Pertaining to the design, operation, and use of machines or tools. Physical: Relating to the body as opposed to the mind or emotions, or being in a material state. Occult Blood: Blood that is not visible to the naked eye, often detected in stool or urine samples through laboratory tests.