private var usaArrayList: MutableList<States>? = null

private val usArrayList: List<States>
        get() {
            usaArrayList = ArrayList<States>(76)
            for (i in 0..49) {
                val states = States(Data.USA_STATES[i], Data.USA_CITY[i])
                usaArrayList!!.add(states)
            }
            return usaArrayList <- Got the error here.
        }