How were explorers important for westward movement?

answer; /// i believe the correct answer is (wine) ; /// good luck

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

the answer would be c. sediment buildup on continental slope

                                                                                -hope this -

answer; the above statement is (true);