Final answer:
Realism's focus on power and the state's survival is extremely relevant in the current multipolar global order. Meanwhile, liberalism's emphasis on international cooperation and constructivism's focus on norms and identity also play significant roles in shaping today's geopolitics.
Step-by-step explanation:
Which one of the three geopolitical theories is most impactful on the global community today, especially in geopolitics? This is a significant question to consider in the field of international relations. Realism, with its focus on power politics and national interest, continues to have a profound relevance in today's multipolar world. States act primarily to secure their own survival, and power dynamics among great powers dictate the balance of power that is central to global security.
Liberalism, on the other hand, emphasizes the role of international cooperation and institutions in promoting global stability and collective security. Liberalism's approach is reflected in the existence and activities of global institutions like the United Nations, which aim to foster peace and cooperation among nations.
Meanwhile, Constructivism provides a nuanced perspective, highlighting how norms, identity, and perceptions shape international relations and can inform the understanding of contemporary conflicts and alliances. By acknowledging the importance of these subjective factors, constructivism adds depth to the analysis of state behavior and international engagement.
While all three theories have merit, the most impactful in today's geopolitics could arguably be realism due to the ongoing strategic competition among major powers and the persistent relevance of military and economic power in international affairs. Nevertheless, the integrated nature of global challenges and the role of international institutions point to significant liberal influence. Constructivism's insights are increasingly pertinent as ideological and normative aspects of global politics come to the fore, especially with regards to identity politics and the role of beliefs in shaping international policy.