The party that ruled in Mexico from 1930 to 2000 was the Institutional Revolutionary Party (PRI). During this period, the PRI held a dominant position in Mexican politics, often referred to as the "perfect dictatorship" due to its control over the government and lack of genuine political competition. While the PRI claimed to be democratic, its rule was characterized by authoritarian practices and limitations on political freedoms, which can be seen as going against the principles of democracy. Here are two reasons why:

1. Lack of genuine political competition:
- One of the key principles of democracy is the presence of political competition, where multiple parties can freely compete for power. However, during the PRI's rule, political competition was severely limited. The PRI maintained a monopoly on power and controlled the electoral process, making it difficult for other parties to challenge their rule.
- Opposition parties faced various obstacles, including restrictions on their activities, censorship, and even violence. The PRI used tactics such as vote-buying, fraud, and coercion to maintain its grip on power, undermining the democratic principle of fair and free elections.

2. Suppression of political dissent and human rights abuses:
- Democracy requires the protection of political dissent and the promotion of human rights. However, under the PRI's rule, political dissent was often suppressed. The government used tactics such as censorship, intimidation, and repression to silence opposition voices.
- Human rights abuses were also prevalent during this period. The PRI government was notorious for its use of violence and repression against political opponents and social movements, including the massacre of students in Tlatelolco in 1968 and the repression of indigenous communities.
- Freedom of expression and association were severely limited, and individuals critical of the government were often subject to persecution and harassment.

In conclusion, the PRI's rule in Mexico from 1930 to 2000 can be seen as going against the principles of democracy. The lack of genuine political competition and the suppression of political dissent and human rights are clear indications of the authoritarian nature of the PRI's rule.

A party named ZANU-PF ruled mexico tilk 1930 to 2000. name of the president was robert mugabe.
reasons why it should not be called a democracy are-
1 It did contest elections but there was no way this party could be defeated.
2 they also spent a handsome amount of money for campaigns,they also changed the polling booth site at the last minute so that people find it difficult to vote.
3 they were known to use many dirty tricks.