article_snippet: It was the incident that helped convince the Americans to enter the First World War.
article_snippet: President Woodrow Wilson said 'the United States is too proud to fight' and demanded an end to attacks on passenger ships.
article_snippet: its sinking provided Britain with a propaganda opportunity and turned public opinion in many countries against Germany.
article_snippet: This helped shift public opinion in the United States against Germany and influenced the United States's eventual declaration of war two years later in 1917.
article_snippet: In January 1917 Germany resumed unrestricted submarine warfare.
article_snippet: After submarines sank a further seven US merchant ships President Woodrow Wilson finally went to Congress on April 6, 1917, calling for a declaration of war on Germany .