American hegemony, which emerged after the Cold War, faces several constraints in the contemporary global landscape. These constraints have the potential to shape the future of American power and influence.

Economic Constraints

• Debt and Fiscal Issues: The United States carries a significant national debt, which can limit its ability to fund domestic and international priorities.
• Economic Rivalry: The rise of economic powers like China challenges American economic dominance and influence in global financial institutions.

Geopolitical Constraints

• Multipolar World: The world is shifting from a unipolar system to a multipolar one, with the rise of powers like China and resurgent Russia, challenging American global preeminence.
• Alliances and Alliances'' Autonomy: American allies are increasingly pursuing their own interests and asserting greater autonomy in foreign policy decisions, reducing American control over their actions.

Military Constraints

• Overextension: Sustaining military presence and engagements in multiple regions simultaneously can strain resources and erode military capabilities.
• Technological Advancements: Rapid technological advancements and the proliferation of military technology narrow the military gap between the United States and potential adversaries.

Diplomatic Constraints

• Diplomatic Disputes: Disagreements with key partners, such as European allies on trade issues and the Iran nuclear deal, can weaken American diplomatic influence.
• International Organizations: Skepticism and disregard for international organizations like the United Nations limit America''s ability to shape global norms.

Domestic Constraints

• Institutional architecture of the American state: A system of division of powers between the three branches of government places significant brakes upon the unrestrained and immoderate exercise of America’s military power by the executive branch.
• Political Polarization: Internal divisions and partisan politics can hamper consensus on foreign policy and international engagement.
• Public Opinion: Public fatigue from prolonged military engagements and skepticism about the benefits of international involvement can constrain foreign policy options.

Global Challenges

• Transnational Threats: Challenges like climate change, pandemics, and terrorism require multilateral cooperation, which can be hindered if the U.S. is seen as unilateralist.
• Global Norms: American actions that deviate from international norms can lead to backlash and challenges to its leadership role.

Future Constraints most likely

Some of these constraints are likely to become more prominent in the future:

• Economic Competition: China''s economic rise is expected to continue, intensifying economic competition and possibly eroding American economic dominance.
• Multipolarity: The emergence of more powerful regional actors, such as India and Brazil, may further shift the global balance of power away from American hegemony.
• Technological Challenges: As technology advances, it may become increasingly difficult for the U.S. to maintain a technological edge in defense and cybersecurity.
• Climate and Pandemic Concerns: Global challenges like climate change and pandemics may demand greater international cooperation, potentially highlighting American reluctance to engage multilaterally.
• Public Opinion and Political Divisions: Domestic constraints, such as political polarization and public opinion, may continue to influence American foreign policy choices.
• NATO: There is only one organisation in the international system that could possibly moderate the exercise of American power today, and that is the North Atlantic Treaty Organisation (NATO). The US obviously has an enormous interest in keeping the alliance of democracies that follow the market economies alive and therefore it is possible that its allies in the NATO will be able to moderate the exercise of US hegemony.

American hegemony faces a complex web of constraints, both internal and external. While the U.S. remains a preeminent global power, these constraints will play a crucial role in shaping the future of American influence and leadership on the world stage. Adaptation to these challenges and adept diplomacy will be essential for the United States to navigate an increasingly multipolar world.