Napoleon's conquest was largely fueled by nationalism, which was a relatively new idea that then took hold of Europe in the 1800s and contributed to late colonial efforts around the world. After Napoleon was defeated, the borders of Europe were redrawn to create a more stable balance of power. These nations shifted to more conservative governments to prevent similar revolutions and rebellion. Importantly,
Southerners approved the Dred Scott decision believing Congress had no right to prohibit slavery in the territories. Later, in 1868, the Fourteenth Amendment overturned the Dred Scott decision by granting citizenship to all those born in the United States, regardless of color.
