between Fort Laramie and Fort Bridger
The south seceded for both reasons. Prior to the Civil War, the South lived in the antebellum period which was a period of great economic success built around their agriculture and cotton plantations which was largely accredited to their slaves who provided free labor. The south believed that states rights protected their way of life and successful economy and they also believed the northern states were infringing on these rights and would take away the source that built such a great and successful economy. Because the slaves built their empire and they believed states rights protected this, they succeeded to keep their way of life.
Translation into english, once they were able to exchange resources with english speaking countries their economy boosted.
B) electronic devices
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The industrial Revolution created a demand among American and European business men, and consequently politicians, for new markets.