Why might a historian question the use of this image when determining whether immigrants were given a fair chance to thrive in the United States in the 19th century​

Is this multipile choice?

Tenochtitlán was the capital of the aztec empire. it was a busy and bustling city where“there are daily more than 60,000 souls, buying and selling, and where are found all the kinds of merchandise produced in these countries.” when cortes arrived in 1519, theenormity of the trading market and the smoothness of it’s running both surprised and  impressed him.