Excel drop down list auto population

Hello everybody,

I am trying to prepare an excel where If I select a COUNTRY from dropdown list in cell A1 next cell B2 dropdown list (STATES) will be generated based on selection in A1, then based on selection in B1, dropdown list (CITY) in C1 will be generated automatically.

Lets say
A1: Country
B1: State
C1: City

Pleasefind the attachment.

Thanks in advance for your help.

Best regards,
Tanza