Because the U-boat campaign killed Americans and destroyed U.S. property it
turned public opinion against Germany.
Throughout the entire campaign.
Affect public opinion
US citizens were probably wondering why the British didn't learn their lesson the first time (in WWI).
Push polls
A statement that best describes opinion leaders is they stand for what they believe. In addition, they tend to affect public opinion more than leaders that aren't opinionated.
Bernhard Furler has written: 'Augen-Schein' -- subject(s): Description and travel, German Foreign public opinion, Public opinion
Volker Depkat has written: 'Amerikabilder in politischen Diskursen' -- subject(s): Democracy, Discourse analysis, Foreign public opinion, German, German Foreign public opinion, German periodicals, History, Political aspects, Political aspects of Discourse analysis, Press and politics, Public opinion 'Lebenswenden und Zeitenwenden' -- subject(s): Politics and government, History
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Factors that affect public opinion include preexisting knowledge, values, and attitudes. In addition, immediate situations and social-environmental factors affect public opinion.
Charles J. James has written: 'German verbs & essentials of grammar' -- subject(s): Textbooks for foreign speakers, German language, Grammar, Verb, English 'The image of present-day American society in English language textbooks used in Germany' -- subject(s): Evaluation, Foreign public opinion, German, German Foreign public opinion, Public opinion, Readers, Textbook bias 'Guide to correspondence in German =' -- subject(s): Commercial correspondence, German, English, German Commercial correspondence, German Letter writing, German language, Letter writing, German, Textbooks for foreign speakers