Drop down menus?

There are 2 drop down menus in my web page. 1st one is for selecting a country and the 2nd one is for selecting a city. I want that if a user selects a particular country (say USA), the 2nd drop down menu shows the cities of that country. On this 2nd drop down menu the user will now select a city and... show more There are 2 drop down menus in my web page.

1st one is for selecting a country and the 2nd one is for selecting a city.

I want that if a user selects a particular country (say USA), the 2nd drop down menu shows the cities of that country. On this 2nd drop down menu the user will now select a city and he'll be taken to the next page.

Please help.

I want to use html and JavaScript.
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