Mutual defense alliances was a significant cause for starting World War I. Basically, what happened was all of the countries were somehow alliances with other countries. Conflict between different countries caused the allied countries to be involved which eventually led to World War I.
The Mutual defense alliances were a significant cause for creating conflict that began at the starting of World War I. In the midst of the turmoil, the countries during this time of war the occurrences between the countries were somehow alliance need with other countries. During this time of the war, the countries began to start starting a large issue in the peace between the countries and started to push some countries to their breaking points. The conflicts between the different countries caused the allied countries to be involved which eventually led to the inevitable beginning of World War I.
Explanation: it starts of as "We the people of the United states in order to form a more perfect union establish justice insure domestic tranquility provide for the common defense promote the general welfare and secure the blessings of liberty to ourselves and prosperity do ordain and establish the constitution for the United states of America."