The one who found the pacific ocean is an Spanish explorer named <span>Vasco Núñez de Balboa. he found the pacific in in 1513</span>
The answer to the first question is: the king of India, he never conquered India. The answer to the second: Phalanxes. The phalanxes were based on the usage of long spears, that would stop the enemy advancing.
The Louisiana Purchase by far, it doubled the nation's land and acquired New Orleans