Answer: Congress of Vienna was a conservative answer to everything new what revolution brought.
Explanation: Congress of Vienna initated a closer collaboration between European governments to suppress all possible focal points of revolutionary events. A good example is a so-called "three liberal years" (1820-23) in Spain. At that time Spanish liberals forced the king Ferdinand VII to rule as a constitutional monarch. Other European monarchies organized a congress which opted for military invasion. Liberals were defeated and absolute rule of Ferdinand VII was re-established.
Petroleum is the most important resource found there.
Congress had decided that once a slave traveled into a free state, they were free and they could never be enslaved again. But in the Dred Scott decision, they changed their mind and people no longer had to honor "once free, always free."
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