What were the causes of Westward Expansion?

Gold rush, mining opportunites, cattle industry, faster travel by railroad, the opportunity to own land cheaply under the Homestead Act.

Explanation:

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i would say b. research typically uses a variety of sources

answer: musical connotation

leonard b. meyer (1918-2007) was an american composer, author and philosopher. his work emotion and meaning in music is perhaps the first major treatise on music. it is a philosophical and psychological work, greatly influenced by koffka (one of the major proponents of gestalt psychology). his work deals with the problem of musical meaning and musical communication.