What, primarily, brought about the formation of the new politics movement, which spurred interest-group growth?

The experiences of the civil rights and antiwar movements.

Explanation:

The New Politics movement occurred in the United States political scene in 1950 and was marked by strengthening position of the Democratic party views.

In particular, civil rights activists and organizations were supported and respective legislation was advocated for. Also, the antiwar position and advocating for a softer relationship with Communist Russia was a characteristic of the New Politics.

the factors that the economies of the muslim empires prosper were:

1- land trade routes-located between three continents  

2- sea trade routes

trade contributed to the spread of muslim empires, and with that islamic culture led to a growing feeling of internationalism resulted in the transfer of technology, science, and other cultural forms.