President Theodore Roosevelt thought that the sinking of Maine was done by the Spanish fleet in 1898 February 15th. He thought that if US doesnt fight back, they are no better than cowards. He then ordered George Dewey to attack the Spanish. But later realizing the Maine was sunk by a mine. Basically this war is a revenge done by the Americans for their pride and the battleship Maine
Because during the manufacturing age there was apprentices and masters and in the scientific age people were just workers and it is impersonal now because unlike the 1 on 1, it is now a 1 on thousands.
Columbus wanted to find a new route to India, China, Japan and the Spice Islands. If he could reach these lands, he would be able to bring back rich cargoes of silks and spices.