50 U.S.C. § 207

The provisions of this chapter in relation to commercial intercourse shall apply to all commercial intercourse by and between persons residing or being within districts within the lines of national military occupation in the States or parts of States declared in insurrection, whether with each other or with persons residing or being within districts declared in insurrection and not within those lines; and all persons within the United States, not native or naturalized citizens thereof, shall be subject to the same prohibitions, in all commercial intercourse with inhabitants of States or parts of States declared in insurrection, as citizens of States not declared to be in insurrection.