The Federally Administered Tribal Areas (FATA; فدرالي قبايلي سيمې; undefined) was a semi-autonomous tribal region in northwestern Pakistan that existed from 1947 until being merged with neighboring province Khyber Pakhtunkhwa, in 2018. It consisted of seven tribal agencies (districts) and six frontier regions, and were directly governed by Pakistan's federal government through a special set of laws called the Frontier Crimes Regulations. It bordered Pakistan's provinces of Khyber Pakhtunkhwa and Balochistan to the east and south, and Afghanistan's provinces of Kunar, Nangarhar, Paktia, Khost and Paktika to the west and north. The territory is almost exclusively inhabited by the Pashtun, who also live in the neighbouring provinces of Khyber Pakhtunkhwa and Northern Balochistan, and straddle across the border into Afghanistan. They are mostly Muslim.
Since the 9/11 attacks in the United States in 2001, the tribal areas are a major theatre of militancy and terrorism. Pakistan Army launched 10 operations against the Taliban since 2001, most recently Operation Zarb-e-Azb in North Waziristan. The operations have displaced about two million people from the tribal areas, as schools, hospitals, and homes have been destroyed in the war. On 2 March 2017, the federal government considered a proposal to merge the tribal areas with Khyber Pakhtunkhwa, and to repeal the Frontier Crimes Regulations. However, some political parties have opposed the merger, and called for the tribal areas to instead become a separate province of Pakistan.
On 24 May 2018, the National Assembly of Pakistan voted in favour of an amendment to the Constitution of Pakistan for the FATA-KP merger which was approved by the Senate the following day. Since the change was to affect the province of Khyber Pakhtunkhwa, it was presented for approval in the Khyber Pakhtunkhwa Assembly on 27 May 2018, and passed with majority vote. On 28 May 2018, the President of Pakistan signed the FATA Interim Governance Regulation, a set of interim rules for FATA until it merges with Khyber Pakhtunkhwa within a timeframe of two years.
The 25th Amendment received assent from President Mamnoon Hussain on 31 May 2018, after which FATA was officially merged with Khyber Pakhtunkhwa.