Featured map :
https://transparentgov.net/cleargov1/1749/angeles-county-solve-messy-problem-using-story-angeles-county
Arcgis Server
https://public.gis.lacounty.gov/public/rest/services/LACounty_Dynamic/Political_Boundaries/MapServer/
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices%2FLACounty_Dynamic%2FPolitical_Boundaries%2FMapServer%2F&url=https%3A%2F%2Fpublic.gis.lacounty.gov%2Fpublic%2Frest%2Fservices%2FLACounty_Dynamic%2FPolitical_Boundaries%2FMapServer%2F&arcgis_online_token=&timeout=9000&select_folder=1&select_layer=
Arcgis online
https://services.arcgis.com/RmCCgQtiZLDCtblq/arcgis/rest/services
Due to very large amount of data on this REST api endpoint, you need to increase the response time limit from 1 second to 9 sec
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fservices.arcgis.com%2FRmCCgQtiZLDCtblq%2Farcgis%2Frest%2Fservices&arcgis_online_token=&timeout=9000