Answer:
An alliance system could cause multiple countries to join a war that starts between only two countries as such alliances create fear and terror.
Step-by-step explanation:
An alliance system, in simple terms, means two or more countries joining forces to work together with a goal or target in mind.
A system of an alliance is also considered a threat for other countries. It is because if strong forces would join together, then they could create chaos together. The starting of World War I was due to the alliance system.
After Germany allied with Austria and Russia with Serbia, the war spread across the globe. Many countries begin to join forces with powerful nations to protect their nations.