The Tularosa ditch war was about water. The settlers of New Mexico were at war because water was always an important and not easily obtained commodity in New Mexico because of the immense heat and drought. People who were original inhabitants were at war with the English population that was moving in because water was scarce as it was without them.
"<span>All of the major powers considered war to be part of a valid foreign policy" is the best option, but it should be noted that militarism was a consequence of nationalism. </span>
The government has grown to meet the needs of the people