<span>Guam, Puerto Rico, and the Philippines all became U.S. possessions as a result of the "Spanish-American War", since these were all help previously by the Spanish. </span>
Both B and D took place, but if you had to choose one, it would be B. The technological advances made farming much more quicker and easier for a large piece of land.
Disagreements over state's rights, slavery, and other issues, the Civil War occurred when the tensions finally grew too much.
