The dashboard swap was the first thing that came to mind too. You could have 2 sheets floating, one always set to the US and one that can be altered by the filter. The former will be behind the latter, so when the filter is cleared and the sheet on top 'disappears', you can see the default US view. An example is attached.
Could you perhaps enable the 'Apply' button on the filter so that the maps doesn't clear until you've made and confirmed a selection?
Hope this helps! Happy New Year!
Swap.twbx 1.1 MB
I'll try that. Thanks!