Would have the world been different if US had accepted Article X and signed Treaty of Versailles?

It is difficult to say conclusively how different the world would have been if the United States had accepted Article X of the League of Nations Covenant and signed the Treaty of Versailles. However, several potential consequences can be considered:

1. Stronger Collective Security: The United States' participation in the League of Nations and its commitment to collective security under Article X could have strengthened the organization and made it more effective in preventing conflicts and promoting peaceful resolutions.

2. Increased Responsibility: The US would have had a greater responsibility to intervene and support other member states in the face of aggression, potentially leading to a more active role in international affairs and possibly preventing or resolving conflicts that arose.

3. Potential for Conflict: The US commitment to collective security could have put it in direct conflict with other countries that were not part of the League of Nations or that had different foreign policy objectives, leading to potential tensions or even war.

4. Financial Implications: The US involvement in the League of Nations would have likely required financial contributions and support, which could have had an impact on domestic spending and priorities.

5. Domestic Politics: The US decision to join the League of Nations and sign the Treaty of Versailles would have been influenced by domestic political factors and public opinion, which could have had an impact on the strength and direction of the country's foreign policy.

6. Shaping Global Order: The US active participation could have influenced the development and shaping of the post-World War I global order, potentially resulting in different outcomes in geopolitical dynamics, the rise of nationalism and conflicts.

7. Alternative Alliances: The US absence from the League of Nations and its disengagement from European affairs might have led to different geopolitical alliances and power dynamics in the region.

8. Changing League Dynamics: The League of Nations' structure, operations, and effectiveness might have been different with the involvement of the United States, potentially influencing its impact on international relations.

It's important to note that these consequences are speculative and depend on a complex interplay of various factors and decisions that could have followed from the US acceptance of Article X and signing the Treaty of Versailles.