One <span>important factor that contributed to the Atlantic slave trade during the time of European colonialism was the high demand for labor in places like the Caribbean, where sugar was being harvested due to its high demand in Europe. </span>
C) populism
For future reference: an easy way to remember the causes is to use the acronym MAIN (as in the MAIN causes) to remember that they are militarism, alliances, imperialism, and nationalism.
Hope this helps :)
"<span>The </span>United States in the 1950s<span> experienced marked economic growth – with an increase in manufacturing and home construction amongst a </span>post–World War II economic expansion<span>. The </span>Cold War<span> and its associated conflicts helped create a politically conservative climate in the country, as the quasi-confrontation intensified throughout the entire decade. Fear of </span>communism<span> caused public Congressional hearings in both houses of </span>Congress<span> while </span>anti-communism<span> was the prevailing sentiment in the United States throughout the period." -Wikipedia</span>
