cotton textiles in Mumbai expanded because it is the well developed has best climate for cotton is well connected by railways,roadways,waterwaysand also by is useful for exporting and importing the finished products and raw materials.
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The cotton textile industries rapidly expanded in Mumbai region because;

There is a moist, humid climate.
There is the availability of skilled and semi-skilled labors.
There is the availability of raw material.
There is a port for importing machinery.