Birthright/jus soli citizenship is where people are granted citizenship simply by being born in a country regardless of their parents citizenship. I live in Ireland and we were the last country in Europe to remove it by a majority vote in 2004 as many people fared that Ireland was becoming a place for birth tourism.
People have talked about bringing it back and pointed out how Canada and the States, have it without much issue and without it, I can create a generation of second class citizens.