What is the mean of authenticity

Which of these was not a key difference between northern and southern states at the constitutional convention? wanting to protect states’ interests vs. a government with strict rules having more, larger cities vs. having fewer, smaller cities wanting to protect agriculture vs. protect industries having many enslaved people vs. using less enslaved labor

Which of the following is an advantage of using nuclear power plants to produce electricity?

Which choice best describes the general trend for the countries shown, for the period 2008 - 2010?