[Flutter] Rerendering widgets in flutter

I am having trouble understanding state management in flutter I have the folloing build method:

Widget build(BuildContext context) {
print("calling build with selectedItem: $selectedItem");

// TODO: implement build
return SafeArea(
child: SingleChildScrollView(
child: Padding(
padding: const EdgeInsets.all(8.0),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: [
Flexible(
fit: FlexFit.loose,
child: DropdownButton<String>(
value: selectedItem,
style: const TextStyle(color: Colors.black),
underline: Container(height: 2, color: Colors.deepPurpleAccent),
icon: Icon(Icons.arrow_downward),
iconSize: 20,
elevation: 16,
items: widget.streetNamesList
.map<DropdownMenuItem<String>>((String value) {
return DropdownMenuItem<String>(
value: value, child: Text(value));
}).toList(),
onChanged: (String? value) {
setState(() {
selectedItem = value;
});
},
),
),
SizedBox(height: 10.0,),
CarListPerStreetWidgetV2(streetName: selectedItem,)
],
),
)),
);
}


The CarListPerStreetWidget implements a future provider that uses the streetname to fetch data from the database. The problem is that when I choose a new value from the drop down menu although the build method gets executed, the build method of CarListPerStreetWidgetV2 also gets executed, but the widget does not get re-initialized with the new selectedItem I am guessing Widgets get initialized once, but how do I pass a state changed from a widget to another?

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