World map turn to black can't see anything on state map, but on inside base it has no problem how to..

There are sometimes graphical glitches in the game which are normally resolved by closing the app and reopening it. If this doesn't fix it then you may need to try reinstalling, but make certain that you have successfully bound your game before you do this.

If this still doesn't help then its possible that a recent update has caused problems for the game running on your device type. You can try a different device or report it to the game support so that they can investigate.