<a href="https://en.wikipedia.org/wiki/World_War_I" id="mwqg" rel="mw:WikiLink" title="World War I">World War I</a>: German <a href="https://en.wikipedia.org/wiki/Submarine" id="mwqw" rel="mw:WikiLink" title="Submarine">submarine</a> <a about="#mwt62" data-mw='{"parts":[{"template":{"target":{"wt":"SMU","href":"./Template:SMU"},"params":{"1":{"wt":"U-20"},"2":{"wt":"Germany"},"3":{"wt":"2"}},"i":0}}]}' href="https://en.wikipedia.org/wiki/SM_U-20_(Germany)" id="mwrA" rel="mw:WikiLink" title="SM U-20 (Germany)" typeof="mw:Transclusion"><i>U-20</i></a> <a href="https://en.wikipedia.org/wiki/Sinking_of_the_RMS_Lusitania" id="mwrQ" rel="mw:WikiLink" title="Sinking of the RMS Lusitania">sinks</a> <a href="https://en.wikipedia.org/wiki/RMS_Lusitania" id="mwrg" rel="mw:WikiLink" title="RMS Lusitania">RMS <i id="mwrw">Lusitania</i></a>, killing 1,199 people, including 128 Americans. Public reaction to the sinking turns many former pro-Germans in the United States against the <a href="https://en.wikipedia.org/wiki/German_Empire" id="mwsA" rel="mw:WikiLink" title="German Empire">German Empire</a>.