an American concession
... that with no documents verifying its establishment, an American concession existed de facto in the Chinese city of Tianjin for more than 40 years?
... that with no documents verifying its establishment, <b id="mwBQE"><a href="./American_concession_of_Tianjin" id="mwBQI" rel="mw:WikiLink" title="American concession of Tianjin">an American concession</a></b> existed <i id="mwBQM"><a href="./De_facto" id="mwBQQ" rel="mw:WikiLink" title="De facto">de facto</a></i> in the Chinese city of <a href="./Tianjin" id="mwBQU" rel="mw:WikiLink" title="Tianjin">Tianjin</a> for more than 40 years?