As American began to industrialize, why was there a growing need for labor unions?

Labor unions helped the production speed.

Explanation:

They created labor unions to make mass production of things needed during these industrial times.

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. 

i think it would be a