Answer :
Most of the people that were transmigrated to the Great Plains in the past 1800s went farmers and ranchers. Option d is correct.
What was the reason of migration in the late 1800s?
People from all over the world, in the late 1800s, determined to leave alone their residences and migrate to the United States. The majority of those that moved to the Great Plains in that period became farmers and ranchers.
Many people migrated to the United States in investigation of fleeing crop failure, economic possibility or opportunity, land and job shortfalls, rise up the taxation, and famine.
Therefore, option d is correct.
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