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New Delhi: For a decade, West Bengal’s politics appeared to move in one direction while power stayed in another. Between 2011 and 2021, the Bharatiya Janata Party (BJP) achieved what once seemed improbable in the state: it rose from near-irrelevance to become the main opposition force. But the same period also showed the durability of Mamata Banerjee’s Trinamool Congress (TMC), which not only survived the challenge but expanded its own base and converted that advantage into overwhelming legislative strength.

The decade did not merely produce a contest. It reordered the opposition, redrew the political map and clarified, at least through 2021, who still knew best how to win Bengal.

Battle for West Bengal

There are political decades that move with the force of a landslide, and others that shift beneath the surface before anyone fully sees what has happened. West Bengal, between 2011 and 2021, managed to do both.

At the start of that period, the BJP was barely present in the state’s assembly politics. In the 2011 election, it secured just 4.06% of the vote and won no seats. The defining event of that year was not a BJP advance, but the end of the Left Front’s long reign. Mamata Banerjee’s TMC won 184 seats with 38.93% of the vote, while the Left Front, though still polling about 40.69%, saw its hold on power collapse. Congress, still relevant then, took 9.09% and won 42 seats.

That election now looks less like a settled transition and more like the opening scene of a wider political realignment. The Trinamool had captured the state. But the opposition system beneath it had begun to hollow out.

By 2016, the first signs of a new challenger had emerged. The BJP’s vote share climbed to 10.16%, and it won three seats. Those numbers still seemed modest in isolation, but they mattered because they signalled direction. The BJP was no longer just an occasional presence. It was becoming a receptacle for anti-Trinamool sentiment, even if the full scale of that shift was not yet visible.

Then came 2021. The BJP surged to 37.97% of the vote and 77 seats, a dramatic leap by any standard and one of the sharpest expansions by a party in contemporary state politics. Yet, they were far behind the Trinamool  which garnered 48.02% of the vote and 215 seats, confirming its decisive lead. 

For West Bengal, that was the first and most important truth of the decade: the BJP transformed the opposition. The Trinamool retained the state.

A rise that was real, rapid and historically significant

The BJP’s growth in West Bengal was not cosmetic. It was not confined to a few symbolic urban pockets, nor was it merely a parliamentary afterglow spilling unevenly into assembly politics. By 2021, the party had become the runner-up in a remarkable number of constituencies and established itself as the only statewide challenger with meaningful reach.

The scale of the change is stark. From 4.06% vote share in 2011 to 37.97% in 2021, the BJP added nearly 34 percentage points in a decade. That kind of growth is too large to explain away as mood, messaging or temporary anger alone. It reflected a deep restructuring of voter alignment.

But to understand that rise properly, one has to avoid the most simplistic reading of it. This was not only a story of the BJP “growing.” It........

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