How to emulate Country/City/State using new Resposive theme

I already downloaded the “taxonomy” plugin, created a taxonomy called: Country/City/State and added some values to it. Then I created a custom field, taxonomy type and assigned “countrycitistate” taxonomy to it. Now all values, eg. USA/Florida/Miami show as a tree instead or having each one its own field just like the non-responsive theme.
I don’t like this tree like setup because the list grows pretty big, how do I implement it so it shows: Country in one field, as soon as I select a country a new State field shows up, autopopulated, and so for the City field. Just like the non-responsive theme,
thanks for your help!