The purpose of making this journey is to find passage to the north west to California.
Step-by-step explanation:
Sweet Betsy is a song which though has happy lyrics in it but the mood of the song is sad and unhappy. There are hardships that the people have to go through in the song.
These hardships were survived by Betsy in the song because she was determined to reach to California and some how or the other she wanted to make it to the west and wanted to survive. This song showed what the pioneers had gone through and how hard their life was.