From and after February 1, 1922, the coastwise laws of the United States shall extend to the island Territories and possessions of the United States not covered thereby on June 5, 1920, and the Secretary of Transportation is directed prior to the expiration of such year to have established adequate steamship service at reasonable rates to accommodate the commerce and the passenger travel of said islands and to maintain and operate such service until it can be taken over and operated and maintained upon satisfactory terms by private capital and enterprise: Provided, That if adequate shipping service is not established by February 1, 1922, the President shall extend the period herein allowed for the establishment of such service in the case of any island Territory or possession for such time as may be necessary for the establishment of adequate shipping facilities therefor: And provided further, That the coastwise laws of the United States shall not extend to the Virgin Islands of the United States until the President of the United States shall, by proclamation, declare that such coastwise laws shall extend to the Virgin Islands and fix a date for the going into effect of same.