which of these events, if added to the timeline, would come between the invention of the mercury thermometer and the lightning rod?

b.

jim crow laws were enacted in northern states.

the effect of the ming leaders banning ships with more than two masts was that there was no further construction of ships masts, because there was a surplus. ming emperors disallowed foreign exploration

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."