During the George W. Bush Administration, U.S. and People's Republic of China (PRC) foreign policy calculations have undergone several changes. President Bush assumed office in January 2001 viewing China as a U.S. "strategic competitor." The White House faced an early test in April 2001 when a PRC naval aviation jet collided with a U.S. Navy reconnaissance plane over the South China Sea. But after the terrorist attacks of September 11, 2001, U.S. officials came to see Beijing as a potentially helpful ally in the fight against global terrorism, while PRC officials saw the anti-terrorism campaign as a chance to improve relations with Washington and perhaps gain policy concessions on issues important to Beijing, such as on U.S. arms sales to Taiwan. At the same time, the PRC was undergoing a substantial leadership transition to a new generation of younger officials. This, plus the U.S. anti-terrorism agenda, helped lead to a new sense of optimism and stability in the U.S.-China relationship that continued to prevail throughout the 108th Congress.