Why did people start to reject the ideology behind nineteenth-century liberalism?

The fundamental liberal ideals of freedom of speech, freedom of the press, freedom of religion, the separation of church and state, the right to due process and equality under the law are widely accepted as a common foundation of liberalism.

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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.