In what area did the Enlightenment philosophers make a major contribution by introducing new ideas?

The 14th amendment overruled the supreme court case of dred scott vs. sandford. the landmark supreme court case determined which of the following points? a.slaves could not be citizens b.non-landowners could not be citizens c.blacks could not be citizens d.all persons born or naturalized in the united states vary differently in citizen status.

Profits are maximized when marginal revenue and marginal costs are a. set c. equal b. less than market price d. greater than market price

Tension between the british and boers was caused primarily by what things?