I believe it's D- A sense of accomplishment mixed with a feeling of regret
The Yellowstone Act of 1872 designated the region as a public “pleasuring-ground,” which would be preserved “from injury or spoilation, of all timber, mineral deposits, natural curiosities, or wonders within.” For a nation bent on settling and exploiting the West, the creation of Yellowstone was surprising.
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The Mormon Trail is the 1,300-mile (2,100 km) long route from Illinois to Utah that members of The Church of Jesus Christ of Latter-day Saints traveled for 3 months. Today, the Mormon Trail is a part of the United States National Trails System, known as the Mormon Pioneer National Historic Trail.
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they thought it was necessary to protect the liberty of americans
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