javascript - How can I make a geographic map with data in specific regions at multiple levels? -

i have data represent @ state , city level.

so map start out showing us, number associated each state.

when user clicks on state, map zoom state , show numbers associated each city.

i surprised find there don't seem mapping libraries support sort of thing. have integrate boundary data , write behavior myself. seems pretty common problem solve, maybe searching wrong keywords. (on note, please feel free recommend different tags or title question)