Final answer:
At the Paris Peace Conference, the 'Big Four' countries with the most influence were Britain, France, Italy, and the United States. These nations had significant impact on the resulting peace treaties, each pushing their national agendas which contributed to shaping the post-war world.
Step-by-step explanation:
The Paris Peace Conference was a significant event that followed the end of World War I, in which leaders of over 30 countries came together to negotiate terms of peace. The conference resulted in treaties that reshaped the map of Europe and established the League of Nations. Of the attending countries, the "Big Four" wielded the most influence during the conference. These were Britain, France, Italy, and the United States. Each of these countries had divergent interests; while Britain and France sought reparations and territorial gains, Italy sought new territories in Europe, and the United States pushed for a "peace without victory." These conflicting agendas shaped the outcomes of the peace treaties that were to dictate world politics in the subsequent years.