A biggie: the transcontinental railroad. Because it would economically improve wherever it was, both the North and the South competed for the railroad to be in their respective territory, evidenced by the Kansas-Nebraska Act and the Gadsen Purchase and induction of California as a free state in 1860.
In addition: people could get land cheap because it was abundant and might leave to start afresh economically.
There's other stuff I can't remember as clearly, but there's a little and I hope it helps :)
B, peeblo people in new mexico revolted
C. More women work in professional jobs
Although there is no table shown to help answer the question, this seems to be the trend in real life, at least in the U.S.
The valley of Mexico is a highlands plateau in central Mexico roughly coterminous with the Present-day Mexico city and the Eastern half of the State of Mexico
Increased productivity is the main contributor to economic growth in U.S. agriculture.
