Christopher Columbus explore for Spain in 1492, 1493, 1498 and 1502. Christopher was trying to find a direct water route west from Europe to Asia. Christopher help his country by exploration by finding “pearls, precious stones, gold, silver, spices, and other objects and merchandise whatsoever”. Christopher Columbus first trip of one year. His second trip was three years. his 3rd trip was also for one year. For his last trip is lasted 2 years.
http://www.history.com/topics/exploration/christopher-columbus http://www.encyclopedia.com/people/history/explorers-travelers-and-conquerors-biographies/christopher-columbus http://www.biography.com/people/christopher-columbus-9254209