Pakistan

The Indus Valley civilization, one of the oldest in the world and dating back at least 5,000 years, spread over much of modern-day Pakistan. During the second millennium B.C., remnants of this culture fused with the migrating Indo-Aryan peoples. The area underwent successive invasions in subsequent centuries from the Persians, Greeks, Scythians, Arabs (who brought Islam), Afghans, and Turks. The Mughal Empire flourished in the 16th and 17th centuries; the British came to dominate the region in the 18th century. The partition in 1947 of British India into the Muslim state of Pakistan (with West and East sections) and largely Hindu India created lasting tension between the two countries. They have fought two wars and a limited conflict -- in 1947-48, 1965, and 1999 respectively -- over the Kashmir territory, a dispute that continues to this day. A third war in 1971 -- in which India assisted an indigenous movement reacting to Bengali marginalization in Pakistani politics -- resulted in East Pakistan becoming the separate nation of Bangladesh.

In response to Indian nuclear weapons testing, Pakistan conducted its own tests in 1998. Pakistan has been engaged in a decades-long armed conflict with militant groups, including the Tehreek-e-Taliban Pakistan (TTP) and other militant networks that target government institutions and civilians.