Which group believed the language of article 10 of the treaty of versailles contradicted the power of congress to declare war?
a. irish americans
b. “irreconcilables”
c. german americans
d. “reservationists”

It was primarily the "German Americans" who believed the language of Article 10 of the Treaty of Versailles contradicted the power of Congress to declare war, since the Germans despised the Treaty of Versailles for imposing harsh reparations on Germany.