One of the ways in which labor unions achieve their goals is by negotiating on behalf of all their numbers what is the term for this

The Term is collective bargaining. Collective bargaining is where union representatives negotiate with management of companies to get better contracts for thier members. This includes pay increases, better working conditions and better benefits.

no statements but ok.

the statement that best describes the idea of manifest destiny that was used in the 19th century would be that "it was fate that the united states would continue to  expand westward," since people thought the us was "destined" to do so. 

it foreshadows the theme of the paragraph and hints the topic that will be discussed in the paragraph!