Assertion: The unique aspect of the Congress party's dominance in India was that it occurred within a democratic framework.
Reason: Despite the presence of multiple parties participating in free and fair elections, the Congress party consistently emerged victorious in election after election.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

India's experience of one-party dominance is not exclusive, as numerous countries worldwide have encountered similar situations. However, a significant distinction sets India apart from these cases. In many instances, the dominance of a single party came at the cost of compromising democratic values. Taiwan, for example, witnessed effective one-party dominance. What sets the Congress party's dominance in India apart is that it unfolded within a democratic framework. Despite the presence of multiple parties contesting elections under fair and free conditions, the Congress party consistently emerged victorious in election after election. This remarkable feat differentiates India's experience from other countries, highlighting the endurance of democracy alongside the Congress party's electoral success.