Tenochtitlan is the capital of the Aztec empre
Many things have changed, but the most common were better jobs, higher wages, and more polluted areas
In the north, in contrast to the south, the system of slavery brought little profit, and the costs demanded largely, and therefore economically was unprofitable. Therefore from it gradually began to refuse and to get rid of slaves.
Free slaves in the North could have tiny farms, sometimes-shop-benches, and workshops, which were visited exclusively by their brethren on the color of the skin. White was condescending to this, sincerely rejoicing in his "democratism."
D. The other facts are true, but wanting to stop Hitler was not a reason, so much as extra motivation.