Because :
1. Socialist credentials became main projects during this period.
2. Indira Gandhi campaigned to implement land reform legislation and land ceiling legislations.
3. She ended her dependence on other political parties by strengthening her party’s position and recommended the dissolution of Lok Sabha in December 1970.
4. The crisis in East Pakistan and Indo-Pak war to establish Bangladesh as an independent one, also enhanced the popularity of Indira Gandhi.
5. Indira Gandhi and her government was not accepted only as a protector of the poor and under privileged but as a strong government also.
6. Congress became popular among different social sections and restored dominance again.