Form ethnicity drop down list

ethnicity-dropdown.html

<fieldset>
  <legend>Ethnicity</legend>
  <select class="form-control dropdown" id="ethnicity" name="ethnicity">
    <option value="" selected="selected" disabled="disabled">-- select one --</option>
    <optgroup label="White">
      <option value="White English">English</option>
      <option value="White Welsh">Welsh</option>
      <option value="White Scottish">Scottish</option>
      <option value="White Northern Irish">Northern Irish</option>
      <option value="White Irish">Irish</option>
      <option value="White Gypsy or Irish Traveller">Gypsy or Irish Traveller</option>
      <option value="White Other">Any other White background</option>
    </optgroup>
    <optgroup label="Mixed or Multiple ethnic groups">
      <option value="Mixed White and Black Caribbean">White and Black Caribbean</option>
      <option value="Mixed White and Black African">White and Black African</option>
      <option value="Mixed White Other">Any other Mixed or Multiple background</option>
    </optgroup>
    <optgroup label="Asian">
      <option value="Asian Indian">Indian</option>
      <option value="Asian Pakistani">Pakistani</option>
      <option value="Asian Bangladeshi">Bangladeshi</option>
      <option value="Asian Chinese">Chinese</option>
      <option value="Asian Other">Any other Asian background</option>
    </optgroup>
    <optgroup label="Black">
      <option value="Black African">African</option>
      <option value="Black African American">African American</option>
      <option value="Black Caribbean">Caribbean</option>
      <option value="Black Other">Any other Black background</option>
    </optgroup>
    <optgroup label="Other ethnic groups">
      <option value="Arab">Arab</option>
      <option value="Hispanic">Hispanic</option>
      <option value="Latino">Latino</option>
      <option value="Native American">Native American</option>
      <option value="Pacific Islander">Pacific Islander</option>
      <option value="Other">Any other ethnic group</option>
    </optgroup>
  </select>
</fieldset>

ethnicity-dropdown.txt

-- Select one --
White
-  English
-  Welsh
-  Scottish
-  Northern Irish
-  Irish
-  Gypsy or Irish Traveller
-  Any other White background
Mixed or Multiple ethnic groups
-  White and Black Caribbean
-  White and Black African
-  Any other Mixed or Multiple background
Asian
-  Indian
-  Pakistani
-  Bangladeshi
-  Chinese
-  Any other Asian background
Black
-  African
-  African American
-  Caribbean
-  Any other Black background
Other ethnic groups
-  Arab
-  Hispanic
-  Latino
-  Native American
-  Pacific Islander
-  Any other ethnic group

Firstly, thank you for this.

I am in the middle of a project where I needed a good starting point and this has served well.

However, I'm finding it really difficult as a developer to juggle the UX/UI with being morally and politically correct, and understandly sensitive to my users.

Take for example Russians. What would they select? Would they feel put out that "Russian" isn't listed explicitly under "White" in such a way that "English", "Welsh" and "Scottish" are?

But then, as a white man myself, I don't (perhaps wrongly) see "Russian" as an ethnicity/race. They are likely White just as I am White. Does it matter if one is White English and the other White Russian?

My client already is asking for "Nationality" and "Birth Country", so I feel we're just asking for their nationality three times!

Do you have some advice? My head's spinning.