The Chinese authorities declare martial law in the face of pro-democracy demonstrations, setting the scene for the Tiananmen Square massacre.

The Tiananmen Square protests were student-led demonstrations held in Tiananmen Square, Beijing during 1989. In what is known as the Tiananmen Square Massacre (Chinese: ; pinyin: Tin'nmn d tsh) or June Fourth Incident (Chinese: ; pinyin: lis shjin) in Chinese, troops armed with assault rifles and accompanied by tanks fired at the demonstrators and those trying to block the military's advance into Tiananmen Square. The protests started on 15 April and were forcibly suppressed on 4 June when the government declared martial law and sent the People's Liberation Army to occupy parts of central Beijing. Estimates of the death toll vary from several hundred to several thousand, with thousands more wounded. The popular national movement inspired by the Beijing protests is sometimes called the '89 Democracy Movement (Chinese: ; pinyin: Bji mnyn) or the Tiananmen Square Incident (Chinese: ; pinyin: Tin'nmn shjin).

The protests were precipitated by the death of pro-reform Chinese Communist Party (CCP) general secretary Hu Yaobang in April 1989 amid the backdrop of rapid economic development and social change in post-Mao China, reflecting anxieties among the people and political elite about the country's future. The reforms of the 1980s had led to a nascent market economy that benefited some people but seriously disadvantaged others, and the one-party political system also faced a challenge to its legitimacy. Common grievances at the time included inflation, corruption, limited preparedness of graduates for the new economy, and restrictions on political participation. Although they were highly disorganized and their goals varied, the students called for greater accountability, constitutional due process, democracy, freedom of the press, and freedom of speech. At the height of the protests, about one million people assembled in the Square.As the protests developed, the authorities responded with both conciliatory and hardline tactics, exposing deep divisions within the party leadership. By May, a student-led hunger strike galvanized support around the country for the demonstrators, and the protests spread to some 400 cities. Among the CCP's top leadership, Premier Li Peng and Party Elders Li Xiannian and Wang Zhen called for decisive action through violent suppression of the protesters, and ultimately managed to win over Paramount Leader Deng Xiaoping and President Yang Shangkun to their side. On 20 May, the State Council declared martial law. They mobilized as many as ~300,000 troops to Beijing. The troops advanced into central parts of Beijing on the city's major thoroughfares in the early morning hours of 4 June, killing both demonstrators and bystanders in the process. The military operations were under the overall command of General Yang Baibing, half-brother of President Yang Shangkun.The international community, human rights organizations, and political analysts condemned the Chinese government for the massacre. Western countries imposed arms embargoes on China. The Chinese government made widespread arrests of protesters and their supporters, suppressed other protests around China, expelled foreign journalists, strictly controlled coverage of the events in the domestic press, strengthened the police and internal security forces, and demoted or purged officials it deemed sympathetic to the protests. More broadly, the suppression ended the political reforms begun in 1986 and halted the policies of liberalization of the 1980s, which were only partly resumed after Deng Xiaoping's Southern Tour in 1992. Considered a watershed event, reaction to the protests set limits on political expression in China that have lasted up to the present day. Remembering the protests is widely associated with questioning the legitimacy of the CCP and remains one of the most sensitive and most widely censored topics in China.

Democracy (Greek: δημοκρατία, dēmokratiā, from dēmos 'people' and kratos 'rule') is a form of government in which the people have the authority to deliberate and decide legislation ("direct democracy"), or to choose governing officials to do so ("representative democracy"). Who is considered part of "the people" and how authority is shared among or delegated by the people has changed over time and at different rates in different countries, but over time more and more of a democratic country's inhabitants have generally been included. Cornerstones of democracy include freedom of assembly, association and speech, inclusiveness and equality, citizenship, consent of the governed, voting rights, freedom from unwarranted governmental deprivation of the right to life and liberty, and minority rights.

The notion of democracy has evolved over time considerably. The original form of democracy was a direct democracy. The most common form of democracy today is a representative democracy, where the people elect government officials to govern on their behalf such as in a parliamentary or presidential democracy.Prevalent day-to-day decision making of democracies is the majority rule, though other decision making approaches like supermajority and consensus have also been integral to democracies. They serve the crucial purpose of inclusiveness and broader legitimacy on sensitive issues—counterbalancing majoritarianism—and therefore mostly take precedence on a constitutional level. In the common variant of liberal democracy, the powers of the majority are exercised within the framework of a representative democracy, but the constitution limits the majority and protects the minority—usually through the enjoyment by all of certain individual rights, e.g. freedom of speech or freedom of association.The term appeared in the 5th century BC to denote the political systems then existing in Greek city-states, notably Classical Athens, to mean "rule of the people", in contrast to aristocracy (ἀριστοκρατία, aristokratía), meaning "rule of an elite". Western democracy, as distinct from that which existed in antiquity, is generally considered to have originated in city-states such as those in Classical Athens and the Roman Republic, where various schemes and degrees of enfranchisement of the free male population were observed before the form disappeared in the West at the beginning of late antiquity. In virtually all democratic governments throughout ancient and modern history, democratic citizenship consisted of an elite class until full enfranchisement was won for all adult citizens in most modern democracies through the suffrage movements of the 19th and 20th centuries.

Democracy contrasts with forms of government where power is either held by an individual, as in autocratic systems like absolute monarchy, or where power is held by a small number of individuals, as in an oligarchy—oppositions inherited from ancient Greek philosophy. Karl Popper defined democracy in contrast to dictatorship or tyranny, focusing on opportunities for the people to control their leaders and to oust them without the need for a revolution. World public opinion strongly favors democratic systems of government.