“The wound is still open and hurts every time you probe it,” said Liu Yang, a Beijing lawyer and a driving force in the movement to regain stolen antiquities. “It reminds people what may come when we are too weak.”

Stoked by populist sentiment but carefully managed by the Communist Party, the drive to reclaim lost cultural property has so far been halting. While officials privately acknowledge there is scant legal basis for repatriation, their public statements suggest that they would use lawsuits, diplomatic pressure and shame to bring home looted objects  not unlike Italy, Greece and Egypt, which have sought, with some success, to recover antiquities in European and American museums.

“The ideal scenario would be for the holders of these relics to donate them back to China,” said Chen Mingjie, the director of the palace museum, whose grounds include a shabby exhibition hall and an evocative pile of stone ruins that are instantly recognizable to any Chinese elementary school student.

The Communist Party has long used the narrative of foreign subjugation as a binding force, one that has become especially useful in recent years as the credo of market economics overruns the last remnants of its Marxist ideology.

But arousing nationalist sentiment, Chinese officials have learned, is a double-edged sword. In 2005, officials allowed public ire against Japan, over territorial disputes and textbooks that glossed over Japanese wartime atrocities, to boil over into violent street protests. After some of the anti-Japanese slogans began morphing into demands for action by Chinese leaders, the authorities clamped down.

The delegation traveling to United States museums appears to have been caught up in a political maelstrom. The relics quest intensified this year after Christie’s in Paris auctioned a pair of bronze animal heads that had been part of a fountain on the palace grounds; the sale was met with outrage in China. In the end, a Chinese collector sabotaged the auction by calling in the highest bids  $18 million for each head  then refusing to pay.