Slavery was allowed according to Article 1, Section 2, Clause 3 of the constitution. It was eliminated by the 13th amendment.
They generally feel that capitalism is harmful and leads to many of the ills of society, such as wealth inequality, poverty, industrial pollution, etc.
In 1733 John Kay with a "Flying Shuttle" or in 1765 James Hargreavers with the "Spinning Jenny"
The breaking up of something such as federation.
Example:
“His rejection of disunion was consistent with his nationalism”
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Karl Marx is the person who coined the term "conflict theory". He was using it in explaining conflict that resulted from the differences between social classes. Karl Marx said conflict resulted from the power differences between the social classes. His cure was the state should own all the property and industries then everyone should work for the common good of all.