What was a significant outcome of the Iran-Iraq War in the 1980s?

The outcome that denotes the significant impact of the Iran-Iraq War in the 1980s is primarily reflected in its duration and the staggering human cost involved, which indeed lasted for eight years and resulted in approximately 67,000 combined combat fatalities. This prolonged conflict, characterized by trench warfare and extensive use of chemical weapons, emphasizes not only the human suffering but also the broader implications it had on regional stability and military strategies in the Middle East.

The scale of the casualties often highlights the war's destructiveness and serves as a stark reminder of the costs of prolonged conflicts. The war did not lead to a decisive victory for either side, which has implications for understanding how unresolved territorial and ideological tensions can perpetuate instability in international relations.

The other outcomes, such as the establishment of a peace treaty or the promotion of democracy in Iran, do not reflect the realities following the war. Similarly, it is important to note that rather than fostering economic growth in Iraq, the war had detrimental effects on both economies involved, leading to long-term economic challenges. Thus, the option that focuses on the war's length and human costs provides a profound understanding of its significant outcomes.