What plan proposed that every five slaves persons would count as 3 free persons

The 3/5th compromise (1787) did.

Hope this answered your question :D

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.