The primary goal of propaganda art is to convey a political message and/or to influence a particular group to support something.
2D design is flat design, like drawing or sketching.
http://resources.hwb.wales.gov.uk/VTC/ngfl/dandt/75/Tutorials/2D%20Design/Section1.pdf
use this pdf to learn how to use it
Before pumpkins people carved lots of vegetables turnips, potatoes and squashes/gourds into Jack O Lanterns.