The 'global warming' would have been a cause that led to the agricultural revolution. As climates became warmer, crops would have grown more sufficiently and domesticated animals would have had a higher chance to survive which increased food supplies and also led to the rise of the industrial revolution.
The correct option is this: THEY BECOME MORE CONSERVATIVE AND MORE POLITICALLY ACTIVE.
The suburb population in America dramatically exploded after the world war II. Many people move to the suburb in order to have a settled and peaceful life. As many people continued to congregate in the suburbs, the people began to become more politically inclined.
Slavery was fairly new, but very prosperous. The European Explorers settled in the New World and captured slaves, which were Native American. It was a good get rich scheme at the time.
Both poems were pubished on the same decade, the 1920's, where there was the ascension of two American music genres, the blues and the jazz, from the Black community to mainstream apreciation later. The poems express the sensations of the subjects hearing the music, and characterize the sounds or musical representations that are being played.
Jazz Fantasia was written by Carl Sandburg and published in 1920. The weary blues was written by Langston Hughes and published in 1926.
So, the right answer would be b. involve musical art forms.