In the construction of this section and Section 89-3-9, the adoption of such sections shall not be construed as meaning that the word "territory" as used in Section 89-3-9 did not include prior to the adoption of these sections the possessions of the United States, or land over which the United States has sovereign power. And any acknowledgment heretofore taken in any possession of the United States, or any land over which the United States has sovereign power, by any of the officials thereof named above in Section 89-3-9 shall be as good and effectual as if made after the adoption of these sections.