The correct answer is <u><em>placer mining</em></u>
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1. Dred Scott v. Sandford
2. Bleeding Kansas
3. Missouri Compromise
4. Kansas-Nebraska Act
5. Compromise of 1850
I don't know exactly what your looking for but, it could do with religion or different ideas of the country.
For example: Let's say that America goes to war with Russia and the Americans didn't want to go to war. The people have a differed idea from the government, meaning that the military does not have the peoples support.
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Answer:
The muslims invaded Spain and in the southern regions, new words with arab ethymologies appeared, they spread their culture and their race. The mix between spaniards and muslims was called a moore, the arab genes still persist in Spain, and the arab ethymologies are present nowadays on the spanish language.
The muslims also tried to impose the islam religion to the catholics, but in 1492, the spanish crown expelled the muslims and the jews from Spain.