Answer:
Young, and 148 Mormons, crossed into the Great Salt Lake Valley on July 24, 1847.
Explanation:
The significant advantage possessed by the Union at the beginning of the Civil War is a larger free population. They also have created big factories that can produce military supplies and ammunition. They have access to railways. This made transportation of men and supplies easier.
Answer:
im pretty sure it is the 4th one
Explanation: