On December 20, 1999, Portugal ended its colonial administration of Macao, which had lasted for over 400 years. The territory was returned to China, becoming a Special Administrative Region under the 'one country, two systems' principle, similar to the handover of Hong Kong two years earlier.

The Arthashastra is a foundational ancient Indian text attributed to Chanakya, also known as Kautilya. It provides comprehensive guidance on statecraft, economic policy, military strategy, and the administration of a kingdom, serving as a manual for rulers on how to govern effectively and maintain power.

The Faraizi movement, founded by Haji Shariatullah in the early 19th century, emerged in Bengal as a socio-religious reform movement. It gained significant momentum as a reaction against the oppressive economic and social policies imposed by the British colonial administration and the local zamindars. The movement sought to purify Islamic practices and mobilize the Muslim peasantry against the exploitation and marginalization they faced under British rule, becoming a significant precursor to later anti-colonial struggles.

Umar ibn Abd al-Aziz, often referred to as Umar II, was a ruler of the Umayyad Caliphate. He reigned from 717 to 720 AD and is widely celebrated in Islamic history for his piety, justice, and efforts to reform the administration of the state, often being compared to the Rashidun Caliphs.

Tamur Lang, also known as Tamerlane or Timur, was a Turco-Mongol conqueror who led a massive military campaign into India in 1398. His forces successfully invaded and plundered Delhi, causing significant destruction to the existing Sultanate administration.

Sher Shah Suri is widely celebrated for his revolutionary land revenue administration. He implemented a systematic survey of land and established a standardized revenue collection process that significantly improved agricultural productivity and state income. These reforms were so effective that they served as a foundational model for the later Mughal administrative structure, particularly the systems implemented by Emperor Akbar.

Abraham Lincoln is the U.S. president most famously associated with the abolition of slavery. His administration oversaw the transition from the Emancipation Proclamation to the constitutional mandate provided by the 13th Amendment. By prioritizing the preservation of the Union and the eradication of the institution of slavery, Lincoln fundamentally transformed the American social and political landscape, ensuring that the practice was legally prohibited across all states following the conclusion of the Civil War.

Liu Bang, posthumously known as Emperor Gaozu, was the founder and first emperor of the Han dynasty. After the fall of the short-lived Qin dynasty, he emerged victorious in the Chu-Han Contention, establishing a stable imperial administration that would govern China for over four centuries.

Chandragupta Maurya established the Mauryan Empire in 321 B.C. after overthrowing the Nanda dynasty. This empire became the first to unify most of the Indian subcontinent under a single central administration, setting the stage for the later expansion and influence of his grandson, Ashoka the Great.

Guru Nanak Dev Ji, the founder of Sikhism, began his spiritual mission and travels around the turn of the 16th century. Historical consensus places the establishment of his teachings and the initial formation of the Sikh community in the Punjab region around 1500 AD, marking the beginning of the Sikh tradition.