What is White Person?

Legal Definition
The acts of congress which authorize the naturalization of aliens, confine the description of such aliens to free white persons.

2. This of course excludes the African race when pure, but it is not easy to say what shade of color or mixture of blood will make a white person.

3. The constitution of Pennsylvania, as amended, confines the right of citi-zenship to free white persons; and these words, white persons, or similar words, are used in most of the constitutions of the southern states, in describing the electors.
-- Bouviers Law Dictionary
Legal Definition
One of the Caucasian race. See 4 Cal. 399.
-- Ballentine's Law Dictionary