Bangladesh (east) & west Bengal was once a combined state (State of Bengal). After partition of Bengal, the part falling in India became West Bengal, (which still retains the … name), while East Bengal (rather east Pakistan) came to be known as Bangladesh, after it gained freedom from Pakistan.ecause it is situated in western india. No. Actually, West Bengal is in eastern India. Before partition, Bangladesh and West Bengal were together. After partition whole Ben … gal was divided into two parts.