The term one-child policy (Chinese: ; pinyin: Y Hi Zhngc) refers to a population planning initiative in China implemented between 1980 and 2015 to curb the country's population growth by restricting many families to a single child. That initiative was part of a much broader effort to control population growth that began in 1970 and ended in 2021, a half century program that included minimum ages at marriage and childbearing, two child limits for many couples, minimum time intervals between births, heavy surveillance, and stiff fines for non-compliance. The program had wide-ranging social, cultural, economic, and demographic effects, although the contribution of one-child restrictions to the broader program has been the subject of controversy.China's family planning policies began to be shaped by fears of overpopulation in the 1970s, and officials raised the age of marriage and called for fewer and more broadly spaced births. Overpopulation, in the eyes of the state officials, would hinder their agenda to boost the national economy and improve peoples standard of living. After a full decade of concerted efforts, a near universal one-child limit was imposed in 1980. It was then officially written into the constitution of the Peoples Republic of China in 1982. As it was written in the constitution, couples have the obligation to abide by the requirements of family planning. All families were restricted to having only one child. Later, some exceptions were allowed for specific groups of the population. In the mid-1980s rural parents were allowed to have a second child if the first was a daughter. It also allowed exceptions for some other groups, including ethnic minorities. In 2015, the government removed all remaining one-child limits, establishing a two-child limit. In May 2021, this was loosened to a three-child limit, in July 2021 all limits as well as penalties for exceeding them were removed.Implementation of the policy was handled at the national level primarily by the National Population and Family Planning Commission and at the provincial and local level by specialized commissions. Officials used pervasive propaganda campaigns to promote the program and encourage compliance. The strictness with which it was enforced varied by period, region, and social status. In some cases, women were forced to use contraception, receive abortions, and undergo sterilization. Families who violated the policy faced large fines and other penalties, such as firings and restrictions for future careers.

The population control program had wide-ranging social effects, particularly for Chinese women. Patriarchal attitudes and a cultural preference for sons led to the abandonment of unwanted infant girls, some of whom died and others of whom were adopted abroad. Over time, this skewed the country's sex ratio toward men and created a generation of "missing women". However, the policy also resulted in greater workforce participation by women who would otherwise have been occupied with childrearing, and some girls received greater familial investment in their education. Even following the removal of the policy, birth rates in China remain lower now than they were previous to the implementation of the policy.The Chinese Communist Party credits the program with contributing to the country's economic ascendancy and says that it prevented 400 million births. Some scholars dispute that estimate, although objections focus on the impact of one-child limits. Their own proposed model of alternate birth rate trends, which incorporate the development factors that would have reduced China's fertility anyway, suggest the impact of the full half century Malthusian program to be far greater than 400 million.

China (Chinese: 中国; pinyin: Zhōngguó), officially the People's Republic of China (PRC; Chinese: 中华人民共和国; pinyin: Zhōnghuá Rénmín Gònghéguó), is a country in East Asia. It is the world's most populous country, with a population of more than 1.4 billion. China spans five geographical time zones and borders 14 countries, the second most of any country in the world after Russia. Covering an area of approximately 9.6 million square kilometers (3,700,000 sq mi), it is the world's third or fourth largest country. The country consists of 23 provinces, five autonomous regions, four municipalities, and two Special Administrative Regions (Hong Kong and Macau). The national capital is Beijing.

China emerged as one of the world's first civilizations in the fertile basin of the Yellow River in the North China Plain. China was one of the world's foremost economic powers for most of the two millennia from the 1st until the 19th century. For millennia, China's political system was based on absolute hereditary monarchies, or dynasties, beginning with the semi-legendary Xia dynasty in the 21st century BCE. Since then, China has expanded, fractured, and re-unified numerous times. In the 3rd century BCE, the Qin reunited core China and established the first Chinese empire. The succeeding Han dynasty (206 BCE – 220 CE) saw some of the most advanced technology at that time, including papermaking and the compass, along with agricultural and medical improvements. The invention of gunpowder and movable type in the Tang dynasty (618–907) and Northern Song Dynasty (960–1127) completed the Four Great Inventions. Tang culture spread widely in Asia, as the new Silk Road brought traders to as far as Mesopotamia and the Horn of Africa. The Qing dynasty, China's last dynasty, which formed the territorial basis for modern China, suffered heavy losses to foreign imperialism in the 19th century.

The Chinese monarchy collapsed in 1912 with the Xinhai Revolution, when the Republic of China (ROC) replaced the Qing dynasty. China was invaded by the Empire of Japan during World War II. The Civil War resulted in a division of territory in 1949 when the Chinese Communist Party (CCP) established the People's Republic of China on the mainland while the Kuomintang-led ROC government retreated to the island of Taiwan. Both claim to be the sole legitimate government of China, although the United Nations has recognized the PRC as the sole representation since 1971. China conducted a series of economic reforms since 1978, and entered into the World Trade Organization in 2001.

China is currently governed as a unitary one-party socialist republic by the CCP. China is a permanent member of the United Nations Security Council and a founding member of several multilateral and regional cooperation organizations such as the Asian Infrastructure Investment Bank, the Silk Road Fund, the New Development Bank, the Shanghai Cooperation Organization, and the RCEP, and is a member of the BRICS, the G8+5, the G20, the APEC, and the East Asia Summit. It ranks among the lowest in international measurements of civil liberties, government transparency, freedom of the press, freedom of religion and ethnic minorities. Chinese authorities have been criticized by political dissidents and human rights activists for widespread human rights abuses, including political repression, mass censorship, mass surveillance of their citizens and violent suppression of protests.

China is the world's largest economy by GDP at purchasing power parity, second-largest economy by nominal GDP, and the world's second wealthiest country by total wealth. The country has the fastest growing major economy and is the world's largest manufacturer and exporter. China is a recognized nuclear-weapon state with the world's largest standing army by military personnel and second-largest defense budget.