may either retain the title and rights of Mexican citizens, or acquire those of citizens of the United States. But they shall be under the obligation to make their election within one year from the date of the exchange of ratifications of this treaty: and those who shall remain in the said territories, after the expiration of that year, without having declared their intention to retain the character of Mexicans, shall be considered to have elected to become citizens of the United States.
In the said territories, property of every kind, now belonging to Mexicans, not established there, shall be inviolably respected. The present owners, the heirs of these, and all Mexicans who may hereafter acquire said property by contract, shall enjoy with respect to it, guaranties equally ample as if the same belonged to citizens of the United States.
Article IX.
The Mexicans who, in the territories aforesaid, shall not preserve the character of citizens of the Mexican Republic, conformably with what is stipulated in the preceding Article, shall be incorporated into the Union of the United States, and admitted as soon as poſsible, according to the principles of the Federal Constitution, to the enjoyment of all the rights of citizens
