how to display another dropdown on select item frm differnet

Question

Respect sir,
I have a problem..I have two partial view. First Partial view consist  a dropdown with items country. Second partial view consist another dropdown with itmes states. When i will select country from the upper dropdown the state dropdown will show.

Without select index method because there are two different partial views.
Is there any other method to solve this problem....

Please solve as soon as you can

Regards,
Mukesh Salaria