PRINCETON, N.J. — BANGLADESH is in fresh turmoil. On Sept. 17, its Supreme Court decided that Abdul Quader Mollah, a leading Islamist politician, should be hanged for war crimes committed during the country’s 1971 war of independence from Pakistan. When he was given a life sentence by a Bangladeshi war-crimes tribunal back in February, tens of thousands of Bangladeshis took to the streets demanding his execution. Since then, more than a hundred people have died in protests and counterprotests.

This may sound remote or irrelevant to Americans, but the unrest has much to do with the United States. Some of Bangladesh’s current problems stem from its traumatic birth in 1971 — when President Richard M. Nixon and Henry A. Kissinger, his national security adviser, vigorously supported the killers and tormentors of a generation of Bangladeshis.

From the partition of the Indian subcontinent in 1947, Pakistan was created as a unified Muslim nation with a bizarrely divided geography: dominant West Pakistan (now simply Pakistan) was separated from downtrodden East Pakistan (now Bangladesh) by a thousand miles of hostile India. Pakistanis joked that their bifurcated country was united by Islam and Pakistan International Airlines. This strange arrangement held until 1970, when Bengali nationalists in East Pakistan triumphed in nationwide elections. The ruling military government, based in West Pakistan, feared losing its grip.

So on March 25, 1971, the Pakistani Army launched a devastating crackdown on the rebellious Bengalis in the east. Midway through the bloodshed, both the C.I.A. and the State Department conservatively estimated that about 200,000 people had died (the Bangladeshi government figure is much higher, at three million). As many as 10 million Bengali refugees fled across the border into India, where they died in droves in wretched refugee camps.