Official USGS one stop US map is here. I feel it is hard to use. Took me a while to figure out what is where. For 300 million public users who never work on ESRI product, it is harder for them to use.
Generally speaking, if you want public to use your ESRI out of box product, you need to train them through youtube tutorial video.
Otherwise, they simply have no idea where to click if they never use ESRI product before.
https://apps.nationalmap.gov/viewer/
Try below these idiot proof tool, as long as you know how to use google map, like most of people do. You can browse above national map in such simple way.
National Map use total 7 server including 6 arcgis server, 1 geoServer
1: carto
2: basemap
3: index
4: hydro
5: geoServer ( not esri product )
6: elevation
7: imagery
server 1: carto.xxx
https://carto.nationalmap.gov/arcgis/rest/services
feature(point, line, polygon)
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fcarto.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fcarto.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=7&select_layer=1
https://transparentgov.net:3200/googlemaps/default?layer_id=1&layer=Incorporated+Places+%28Civil%29¢er_lat=36.02324054313774¢er_long=-90.98316903815328¢er_zoom=12&url=https%3A%2F%2Fcarto.nationalmap.gov%2Farcgis%2Frest%2Fservices%2Fgeonames%2FMapServer&overlayType=overlayType_image&panto=0
server 2: basemap.xxx
https://basemap.nationalmap.gov/arcgis/rest/services
Raster, Imagery,
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fbasemap.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fbasemap.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=2&select_layer=0
https://transparentgov.net:3200/googlemaps917/default?layer_id=0&layer=Layers¢er_lat=33.808860174773244¢er_long=-116.09899780700249¢er_zoom=10&url=https%3A%2F%2Fbasemap.nationalmap.gov%2Farcgis%2Frest%2Fservices%2FUSGSTopo%2FMapServer&overlayType=overlayType_image&panto=0
server 3: index.xxx
https://index.nationalmap.gov/arcgis/rest/services
Index, Dynamic index,
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Findex.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Findex.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=5&select_layer=0
https://transparentgov.net:3200/googlemaps/default?layer_id=0&layer=CellGrid_7_5Minute¢er_lat=36.43753246638459¢er_long=-76.31250193244084¢er_zoom=13&url=https%3A%2F%2Findex.nationalmap.gov%2Farcgis%2Frest%2Fservices%2FDynaMap_Index%2FMapServer&overlayType=overlayType_image&panto=0
server 4: hydro.xxx
https://hydro.nationalmap.gov/arcgis/rest/services
water, hydrology, river, lake,
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=5&select_layer=1
https://transparentgov.net:3200/googlemaps/default?layer_id=1&layer=Flowline¢er_lat=34.049039¢er_long=-118.246521¢er_zoom=16&url=https%3A%2F%2Fhydro.nationalmap.gov%2Farcgis%2Frest%2Fservices%2F3DHP_all%2FMapServer&overlayType=overlayType_image&panto=0
server 5
https://www.mrlc.gov/geoserver/web/
This is open sourced geoServer on github, not ESRI product.
server 6: elevation
https://elevation.nationalmap.gov/arcgis/rest/services
Elevation Raster layer
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Felevation.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Felevation.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=2&select_layer=-1
https://transparentgov.net:3200/googlemaps910/default?layer=3DEPElevation¢er_lat=33.989103941496005¢er_long=-117.30115764913147¢er_zoom=11&url=https%3A%2F%2Felevation.nationalmap.gov%2Farcgis%2Frest%2Fservices%2F3DEPElevation%2FImageServer&overlayType=overlayType_image&panto=0
server 7:
https://imagery.nationalmap.gov/arcgis/rest/services
Imagery raster
https://transparentgov.net/json2tree/esri/server/folder.html?org=https%3A%2F%2Fimagery.nationalmap.gov%2Farcgis%2Frest%2Fservices&url=https%3A%2F%2Fimagery.nationalmap.gov%2Farcgis%2Frest%2Fservices&arcgis_online_token=&select_folder=4&select_layer=-1
https://transparentgov.net:3200/googlemaps910/default?layer=USGSNAIPImagery¢er_lat=38.746969954612375¢er_long=-66.16376716332398¢er_zoom=5&url=https%3A%2F%2Fimagery.nationalmap.gov%2Farcgis%2Frest%2Fservices%2FUSGSNAIPImagery%2FImageServer&overlayType=overlayType_image&panto=0