The Spinning Jenny allowed the string of cotton to be put into a thicker fiber, that could hold up to more extremes, at a faster rate.
The first step in solving labor problems and carry out the change is the negotiation of the workers, for a better benefit; better wages,health benefits paid sick/holidays as well a chance to grow with the company.
The convention of 1786 was actually called the Annapolis convention and its goal was to discuss and develop a consensus about reversing the protectionist trade barriers that each state had erected. The Constitutional Convention happened in 1787 and its goal was to revise the Articles of Confederation.
The Declaration of Independence
Not really sure but could be because The pyramid had sloping sides so that the dead pharaoh could symbolically climb to the sky and live forever.