I am trying to erase around 200 county road shapefiles from a state boundary. The files become too large to work with when the roads are merged into one state roads file. How can I iterate the erase process so that all the roads are removed from my one state shapefile, instead of manually erasing each road one after another? Note, I have buffered the roads so that they are no longer polylines. I am using Arcmap 10.2.2.