So, unfortunately, you can't send Action's to the title in this way...and the title needs to reflect some field.
In the attached I've added ATTR([Country]) & ATTR([State]) into the detail pane of your line chart, and can then access these in the title. I've made them ATTR else, when nothing is selected, it would show a line for each Country/State (as bringing in the un-ATTR dimension creates the Viz at the Country/State LoD). When nothing is selected ATTR([Country]) & ATTR([State]) equate to *...this is Tableau's way of saying that there is more than one value for this, but one you hover over the map this updates to reflect the selection. To combat this I've added an alternative method, using a formula to look if a selection has been made (via a Hover) and using that to create the title (I also amended your filter action a bit, so it was a dashboard and not worksheet action).
Hope that all makes sense, and does the trick for you