In this tutorial, learn how to use the Dissolve Boundaries tool to to merge polygons based on an attribute. To follow along, Open the Kyushu Municipalities [https://www.arcgis.com/apps/mapviewer...] web map.  For more details, read the test version [https://learn.arcgis.com/en/projects/...] of this tutorial at Learn ArcGIS. The data used in this video is derived from 平成 27 年国勢調査 市区町村界 - Japan Municipality Boundaries ECM [https://www.arcgis.com/home/item.html...]: Esri Japan, Statistics Bureau of Japan.