Sentence:  ... when we shall recognize in our press and at the ballot box no votes but American votes, and no citizens but simply <WSD>unhyphenated</WSD> American citizens; when we shall insist that every man who places a ballot in our ballot box shall be able to read that ballot in the language of Lincoln and Grant, we shall have reached the hour when we may begin the most momentous and delicate task ever set before a people—the creation of a great nation out of the fragments of many diverse and even hostile nationalities. 
Meaning of the word marked with <WSD> tags:  Of people, belonging to a single ethnicity or nationality: names for multi-ethnic/multi-nationality groups generally require a hyphen to connect the names being combined.