Allied powers | World War... www.britannica.com

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Allied & Central (Axis)... www.coolkidfacts.com

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Causes of World War I fasttrackteaching.com

Allied Powers of World War... www.historycrunch.com

Allies of World War I -... en.wikipedia.org

United States Participation... peacehistory-usfp.org

United States Participation... peacehistory-usfp.org

Central Powers |... www.britannica.com

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Allied & Central (Axis)... www.coolkidfacts.com

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Allies of World War I -... en.wikipedia.org

Contemporary History World... education.cfr.org

Allied powers | World War... www.britannica.com