Dynamic Drop Down Menus

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   Can anyone help part of a form I am using will use 2 drop down menus, the first looks like this (just removed a few option value lines for this example)

<select name="area" id="area">
  <option value="en">England</option>
  <option value="cy">Wales</option>
  <option value="sc">Scotland</option>
</select>

How do I code the second dropdown menu to that only relevant options are available.

For example if England is selected it won't list places in Wales or Scotland.