In 1921, Ireland was partitioned between north and south, but it was far from the only new state or new border in Europe. This talk puts Irish partition in context. William Mulligan teaches history at University College Dublin. This lecture was part of a series of talks, aimed at putting Ireland’s revolutionary experience of 1916-1923 in a world context. The lecture took place in the Teachers’ Club on Parnell Square on the 1st of March 2017.