The answer would be the revolutions of 1848. Principle of separate spheres relates to foreign trade with China. Laissez-Faire economics was a phase in which the government did not really intervene with economic activities.
An example of symbolic speech heads back in time to the Tinker v. Des Moines case when a principal suspended two students for fear of disruption whenever they wore a black arm band to school.
A. They had differing ideas on a powerful national gov.
Generally speaking, Louis Pasteurs' research contributed to "<span>c. new laws banning child labor"</span> during the industrial revolution, since this was one of the major issues that was taking place.