a couple of ways.
first, if your lists are short (and only you can decide what short is), then you can populate your lists with a single compound fex.
second, if your lists are too long for the compound method, then the complex method works,
2 separate fexes.
the first box has a default value of , say, 'zero', and that 'zero' has a description like 'select your country here';
the 2nd box's fex has a default value of, say, 'zero', and that 'zero' had a description like 'waiting for you to select your country'..and then has NOTHING below it.
the 2nd box's fex evaluates the first box (value='zero') and doesn't produce its entire long list until some actual value (anything but 'zero') gets selected in the 1st box, then the 2nd fex says 'oh you've selected something, ok i'll give you a whole long list now'
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