1. Tamil Nadu has a vast coastline therefore the region has been involved in trade with both South – East and West Asia for several centuries.
2. The introduction of cotton cultivation in Western and Southern Tamil Nadu by the Colonial Government led to the emergence of large – scale textile Industries.
3. The introduction of Railways also expanded the market for cotton yam and helped to develop this sector.
4. The Chennai and Tuticorin ports in Tamil Nadu led to the greater Industrial development.
5. The growth of Jaggery Industry in South Tamil Nadu and match factory in the Sivakasi region, Leather production in Dindigul, Vellore and Ambur region are remarkable development of Industries in Tamil Nadu.
6. Another major development in the Western region is the introduction of electricity from hydro- electric power in 1930’s.
7. The emergence of workshops for servicing engines and also for demand for spare parts.
8. Bharat Heavy Electricals Limited (BHEL) in Tiruchy and Avadi Industrial Estate in 1950’s to supplying to the large firms in the region.
9. The Salem Steel Plant was set up in 1973 to produce stainless steel.
10. In 1990’s with the,ideas of Liberalisation phase, many MNC’s has been opened such as Nokia, Foxconn, Samsung etc.,
11. Tamil Nadu has been halied as a model for successfully using the SEZ route to attract productive Investments also.