After years of progress in Northern Ireland, some people worry that a vote to leave the European Union would prove a major setback.<br /><br />Read more: <br />http://www.dw.com/en/cameron-begins-final-push-to-avoid-brexit-as-campaigning-resumes/a-19341889<br />http://www.dw.com/en/brexit-campaigning-resumes-polls-boost-remain/a-19340753<br />http://www.dw.com/en/opinion-brexit-would-be-a-big-mistake-for-uk-europe/a-19338213
