Two part question: 1. Why did South Carolina and nine other states secede after years of political, sectional, and economic disagreements?

2. What was the result of their secession four years later?

6 pounds is equivalent to 92 ounces.

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map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.