Final answer:
The Treaty of Versailles was responsible for the creation of Czechoslovakia, Estonia, Yugoslavia, Finland, Latvia, and Poland at the end of World War I.
Step-by-step explanation:
The treaty that was responsible for the creation of Czechoslovakia, Estonia, Yugoslavia, Finland, Latvia, and Poland at the end of World War I is the Treaty of Versailles. The Treaty of Versailles was signed in 1919 and it redrew the map of Europe, establishing new countries and borders. It also created the League of Nations, an international organization aimed at promoting peace and cooperation.