What is history based on social-science? and what are it's branches and it's meaning?

Explanation:

Social science is a category of academic disciplines, concerned with society and the relationships among individuals within a society. Social science as a whole has many branches. These social sciences include, but are not limited to: anthropology, archaeology, communication studies, economics, history, musicology, human geography, jurisprudence, linguistics, political science, psychology, public health, and sociology. The term is also sometimes used to refer specifically to the field of sociology, the original "science of society", established in the 19th century

d.prevent the spread of communism outside of eastern europe.

not to sure thinking it would be a hope this