The most important reason for the growth of labor unions in the latter half of the 19th century was

answer; ///i believe that the correct answer is because the house and senate frequently pass different versions of the same bill;

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations. click to let others know, how is it

answer; basic psychology;

answer; early greeks were econimically stagnant and cut off from other near eastern civilizations;