According to Nostrand, what did the Spanish use to maximize the use of scarce water and limited arable valley floors

long lots

Explanation:

During, the colonization of New Mexico, Spaniards laid the agricultural plots of land, which were called long lots. The long lots were the way to maximize the use of scarce water and limited arable valley floors. These long and ribbon-like fields on the uphills where efficient to conduct water through gravity from the irrigation ditch. This gave access to all the farmers with water for irrigation through the ditch.

and contrast the 1920 and 2010 census reporting methodologies in an essay of about three hundred words