Solution

There was a difference between one party domination in India and Mexico. In Mexico, this was a one party system only not dominance because:
1. In India, the Congress party dominated on behalf of popular consensus but Institutional Revolutionary Party (PRI) (in Spanish) ruled on behalf of perfect dictatorship.
2. In India, free and fair elections took place, where the losing of election was also fair but it Mexico, elections were based on malpractices, dominated by PRI.