A) he negotiated a clear border between Spain & France.
B) he stopped the Muslim advance from Spain into France.
C) he welcomed ambassadors and scholars from Moorish Spain.
D) he established a Christian kingdom in a corner of northern Spain.
I guess there should be options to choose. Anyway, I know that the answer is: Christopher Columbus planned to find a more direct route to Asia by <span>sailing west across the Atlantic Ocean</span>. He convinced Spanish government to finance a plan to find a rout to Asia through the west across Atlantic. He reached the Caribbean but he thought that he reached West Indies island. This is how European colonization of America began.
United States was an agrarian-based nation. Prior to World War II, people were involved in agriculture than other existing industries. Technological improvements in farming introduced during the war years reduced farming dependencies on manual labor freeing people to move to the cities to find white collar jobs after the war.