Why are the horse latitudes known as the divergence zones?

Horse latitudes or Subtropical High are subtropic latitudes between 30 and 35 degrees both north and south. This region, under a ridge of high pressure called the subtropical high, is an area which receives little precipitation and has variable winds mixed with calm. 

So basically, because these are belts of high pressure around the earth, the movement of winds will be out of these areas, leaving them calm. Air flow will move away from these high pressure zones, and divergent by definition means, "tending to move apart in different directions." 

ANSWER: 
So because of the movement of winds away from these latitudes, they are called divergent latitudes

1920 census

the census was scheduled for january the 1st, as the government believed that more farmers would be in their homes by that time instead of april. the census did not ask about unemployment, the number of children, and how long was a couple married were not taken into consideration. individuals were considered as residents of the places they normally slept, not the places were they worked at or visited.

2010 census

the census was scheduled for april 1st, 2010. it was the shortest census in history: it only contained 10 questions related to name, age, gender, ethnicity, relationship, and whether the citizen owned a home or rented one. the government launched a website in order to provide the citizens with information regarding the census. there were also "teach census weeks" in schools nationwide.