but haven't adopted their own constitutions. One unorganized territory, American Samoa, has its own constitution. The remaining 13 unorganized territories have no permanent populations and are either under direct control of the U.S. Government or operate as military bases. The commonwealths of Puerto Rico and the Northern Mariana Islands (CNMI) do not have organic acts but operate under local constitutions. Pursuant to the acquisition of Puerto Rico under the Treaty of Paris, 1898, the relationship between Puerto Rico and the United States is controlled by Article IV of the United States Constitution. Constitutional law in the CNMI is based upon a series of constitutional documents, the most important of which are the 1976 Covenant to Establish a Commonwealth of the Northern Mariana Islands in political union with the United States of America, which controls the relationship between the CNMI and the United States; and the local commonwealth constitution, drafted in 1976, ratified by the people of the CNMI in March 1977, accepted by the United States Government in October 1977, and effective from 9 January 1978. List of constitutions The following is a list of the current constitutions of the states in the United States. Each entry shows the ordinal number of the current constitution, the official name of the current constitution, the date on which the current constitution took effect, and the estimated length of the current constitution. Also below are a description of organic instruments with respect to additional territory. Note that constitutions of states that were independent countries prior to admission, and constitutions used by rebelling states participating in the American Civil War are not counted. Federal district charter The District of Columbia has a charter similar to charters of major cities, instead of having a constitution like the states and territories. The District of Columbia Home Rule Act establishes the Council of the District of Columbia, which governs the entire district and has certain devolved powers similar to those of major cities. Congress has full authority over the district and may amend the charter and any legislation enacted by the Council. Attempts at statehood for the District of Columbia have included the drafting of three constitutions in 1982 1987, and 2016 all referring to the district as the "State of New Columbia". Commonwealth and Territorial constitutions The Constitution of the Commonwealth of Puerto Rico, July 25, 1952. It was ratified by Puerto Rico's electorate in a