The United States is hereby authorized to acquire lands by? condemnation or otherwise in this State for the purpose of preserving? the navigability of navigable streams and for holding and administering such lands for national park purposes: Provided, that this section and N.C. Gen. Stat. § 104-9 shall in nowise affect the authority conferred upon the United States and reserved to the State in N.C. Gen. Stat. § 104-5 and 104-6. (1925, c. 152, s. 1.)