Why did the allies wait until after the war to acknowledge the full extent of the holocaust ?

answer; /// i believe that the correct answer is (d)the huang he river valley;

b)

it created free trade throughout the colonial territories.

china has confucianism thats everywhere in asia but it isn't really a religion.  

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.