Predict the monomer units that combine to form polyurethane. 
Definitions:
Self-Determination
The principle that peoples have the right to freely choose their sovereignty and international political status with no interference.
League of Nations
An international organization established after World War I to promote peace and cooperation among countries, though it ultimately proved ineffective at preventing conflict.
Election of 1916
The presidential election in the United States in which Woodrow Wilson was re-elected, largely focusing on issues of American neutrality in World War I.
Charles Evans Hughes
An influential American statesman, Supreme Court Justice, and Secretary of State who served in the early 20th century, known for his contributions to law and diplomacy.
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