The answer is: Water management projects created huge reservoirs and lakes where there had been dry canyons.
The National Reclamation Act of 1902 was a federal law that was passed in order for the federal government to start major irrigation projects in the West.
The result of these major projects was the creation of complex structures and systems(reservoirs and lakes) that would allow for the transformation of arid lands into farm capable lands.
Nationalism usually does provoke violence and rebellions within nations. A great example of such a thing was the assassination of Archduke Franz Ferdinand by a Bosnian Serb due to the fact he was a major Serbian Nationalist and believe Bosnia should be apart of Serbia.
The Land Ordinance of 1784 redistributed the new lands between the Appalachian Mountains and the Mississippi River into new territories. The original states had laid claim to the new lands but Jefferson created the land ordinance to ensure new states could be admitted.
The Land Ordinance of 1785 established a systematic way to divide the new western lands into 1 acre plots to create townships. Each township contained 36-1 acre square plots. With the 16th plot reserved for a school. The act set pricing for land that stayed in place until the 1860s. The reserved plot for schools demonstrated the government's desire to create public schools and to make education a priority.
The Northwest Ordinance of 1787 created the process for lands to become a territory and then to become a state. The act stated slaves were not allowed in the Northwest Territory and all civil liberties were to be protected by the governments. This act demonstrated the progress the Founders were hoping to make and the eventual goals they had for the country in creating new lands.
It's "C) Surfaces with higher pH levels protect lichens from acid rain."