Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Irish Border Residents Watch for Brexit Fallout Associated Press BELFAST, NORTHERN IRELAND - The border was drawn in 1921, splitting communities and sometimes property, as the British government sought to create a home for the majority Protestant population of Northern Ireland at a time when the largely Catholic Republic of Ireland won its independence. Today, that 310-mile (500-kilometer) frontier is largely invisible. The only way motorists know they have crossed into Northern Ireland is from the speed limit signs, which use miles per hour measurements, rather than the metric system used in the south. Keen observers might notice a slight change in the pavement as well. As Brexit takes effect Friday, residents on both sides of the border are concerned about protecting the relative peace and prosperity after the 1998 Good Friday Agreement. That accord helped end three decades of sectarian violence between paramilitary groups that wanted to reunify Ireland and those who insisted the six counties of Northern Ireland should remain part of the UK. .