Here Uncle Sam is being carried on the backs of South America and Israel, his servants.

"Is This a Freedom?" This poster portrays Americans as racist, the Statue of Liberty is holding a burning cross, referring to the KKK.  This reference was important as both the USSR and USA were trying to gain allies in the newly decolonized countries in Africa.  

“Here again blood and oil is being poured”

This shows the US and allies milking blood and oil from Middle East. The continent is Middle East, and the capitalistic world leaders are taking it for all it's worth.