The statement which describes a result of the Spanish-American War was that a) the United States acquired territories in the Pacific and the Caribbean. This was because of the Treaty of Paris which was signed in 1898 where negotiations were made for the United States to gain temporary control over Cuba and the ownership of Puerto Rico, Guam and the Philippines was given from Spain to the United States. In return, the United States had to pay a lump sum to Spain to gain acess to the Philippines.
Mississippi became wealthy and powerful because of its location on the Mississippi river and its position towards the middle of the nation. The Mississippi river was used to carry goods up and down America, and anyone going West would most likely pass through Mississippi, adding to its revenue and, therefore, wealth.