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(a) No person except as otherwise provided in this subchapter shall hereafter be naturalized as a citizen of the United States upon his own application who cannot demonstrate-
(1) an understanding of the English language, including an ability to read, write, and speak words in ordinary usage in the English language: Provided, That the requirements of this paragraph relating to ability to read and write shall be met if the applicant can read or write simple words and phrases to the end that a reasonable test of his literacy shall be made and that no extraordinary or unreasonable condition shall be imposed upon the applicant; and
(2) a knowledge and understanding of the fundamentals of the history, and of the principles and form of government, of the United States.