Appositives are also known as parenthetical statements, and they are usually denoted by commas in the middle of a sentence. They usually contain information that, while it is relevant, isn't 100% necessary for the sentence to have. In this situation, the appositive is "either Juan or Linda," because it is separated by commas, and again, it is relevant, but the sentence would be just fine if that phrase was omitted; it would just be a bit more vague as to whom the sentence is referring.
<span>And when 100 or 1,000,000 people enter into a free government, they do not barter away . . . they simply pledge themselves to protect each other in the enjoyment of them, through prescribed judicial and legislative tribunals.
Ellipses are supposed to simplify and cancel out a part of a statement/paragraph in order to get to the point or get unneeded information out of the way. </span>