Azcapotzalco became an economic center of enormous power. In 1426, When Tezozómoc died, his son Maxtla took power. Maxta failed to maintain alliances and lost the crucial support of the Aztecs by arranging for the assassination of their tlatoani Chimalpopoca. As a result, Tenochtitlan banded together with its neighbors, including Texcoco and Tlacopan, into what became known as the (second) Triple Alliance. Together they attacked and sacked Azcapotzalco in 1428. Hegemonic power passed to Tenochtitlan and, consequently, to the Aztec Empire.