They are experiencing Discrimination.
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The war of 1812 fought between the Great Britain and United States. The war bounded both the countries on the basis of trade. This war created the economic opportunity for United States as war resulted in growth in factory system in United States.
The Embargo Act helped the United States to establish factories for manufacturing goods in domestic line. This act halted the competition from factories of England and France. This act helped domestic producers to sell their products as earlier they were facing competition from France and England
It is definitely D. Congress fought so hard to keep the Union together prior to the Civil War that they instilled a gag order against speaking of the slavery issue in Congress.
The correct answer is - trade.
The Sumerians engaged in trade with their move of exchanging their surplus food for materials like the copper that they needed to develop their weapons and thus their army forces. This was a very smart move from their side because they managed to use the resource they had in abundance but was scarce in the other surrounding areas so that they take what they need to become stronger and pretty much defend more efficiently from the same people they were engaging in trade with.