Which of these technological advances had the least direct effect on economic growth in the u. s.?

Explain the value of statistics and other data to positive economics and to normative economics

Can someone me with this plz? ! i'm putting 20 points on it!

Lomexico, central america, and the caribbean: mastery testselect the correct answer.which of the following was the leading cause of death among native americans after the arrival of europeans? a.conquistadorsb.diseasec.starvationd. warreset