▁vac ated ▁by ▁the ▁US ▁military ▁and ▁returned ▁to ▁the ▁German ▁government . ▁In ▁ 1 9 4 7 ▁the ▁city ▁became ▁part ▁of ▁the ▁federal ▁state ▁Free ▁Han se atic ▁City ▁of ▁Bre men ▁and ▁was ▁consequ ently ▁renamed ▁from ▁Wes erm ünd e ▁to ▁Bre mer h aven . ▁Today , ▁Bre mer h aven ▁is ▁therefore ▁part ▁of ▁the ▁city - state ▁of ▁Bre men , ▁being ▁to ▁all ▁int ents ▁and ▁purposes ▁a ▁state ▁compr ising ▁two ▁cities , ▁while ▁also ▁a ▁city ▁in ▁its ▁own ▁right . ▁This ▁is ▁complicated ▁somewhat ▁by ▁the ▁fact ▁that ▁the ▁city ▁of ▁Bre men ▁has ▁owned ▁the ▁" over se as ▁port " ▁within ▁Bre mer h aven ▁since ▁ 1 9 2 7 . ▁To ▁further ▁comp licate ▁matters , ▁a ▁treat y ▁between ▁the ▁two ▁cities ▁( as ▁mentioned ▁in ▁Section ▁ 8 ▁of ▁Bre mer h aven ' s ▁municipal ▁constitution ) ▁makes ▁Bre mer h aven ▁responsible ▁for ▁the ▁municipal ▁administration ▁of ▁those ▁parts ▁owned ▁directly ▁by ▁Bre men ▁( known ▁as ▁st adt bre m isch ). ▁ ▁Trade ▁▁ ▁The ▁port ▁of ▁Bre mer h aven ▁is ▁the ▁six teenth - larg est ▁container ▁port ▁in ▁the ▁world ▁and ▁the ▁fourth - larg est ▁in ▁Europe ▁with ▁ ▁of ▁cargo ▁handled ▁in ▁ 2 0 0 7 ▁and ▁ 5 , 5 ▁million ▁in ▁ 2 0 1 5 . ▁The ▁container ▁terminal ▁is ▁situated ▁on ▁the ▁bank ▁of ▁the ▁river ▁Wes er ▁opening ▁to ▁the