In the year 1998, the West Bengal Trinamool Congress made ally with some of the unsuccessful electorates from the different states in India to form the All India Trinamool Congress. It was formed with the objective to take the Trinamool Congress to the national level. It took part in the elections of several other Indian states along with the elections in West Bengal.
Although it could not make a big mark on the national front, Trinamool Congress won the control of Kolkata in the municipal elections in the year 2000. In the next election in the year 2005, it lost its position.
Around the election of the Lok Sabha in the year 2004, the All India Trinamool Congress led by Mamata Banerjee, merged with a fraction of Nationalist Congress Party in India. This breakaway part of the Nationalist Congress Party was led by P.A. Sangma. This newly formed party was known as Nationalist Trinamool Congress.
Before this union, there were different sections of the Trinamool Congress. These different divisions were named as:
- Trinamool Chhatra Parishad - The students' faction of the Trinamool Congress party,
- Indian National Trinamool Trade Union Congress - the trade union wing of Trinamool Congress
- Nationalist Democratic Teachers’ Association – the teachers branch of Trinamool Congress
