The use of uncle sam to represent the us is often use in political cartoons this is an example of which technique

The use of Uncle Sam to represent the US is often used in political cartoons is an example of symbolism.

Explanation:

Symbolism is a technique that uses symbols to give symbolic meanings to ideas.  

Uncle Sam is a popular symbol for the US; It was purposefully designed to interpreting and framing political discourse and national identity.  Uncle Sam is a very influential and iconic symbol of America, it is used to represent the American nation in foreign press; it was also present in War recruiting posters. In all, is a familiar symbol of patriotism and government of the US.  

the ss was the main organization responsible for the genocidal murder of around six million people of european ethnic minorities, essentially jews, in the holocaust. the members of all its branches committed war crimes and crimes against humanity during the second world war (1939-1945). likewise, the ss were involved in commercial enterprises and exploited the inmates of the concentration camps as slave laborers.

the tortures and assassinations committed by the ss were the result of an ideology developed long before the armed conflict, this ideology was based on the racial supremacy of the germans over the rest.