The basic idea behind individualism is that the individual
person and his or her interests are a very important (or perhaps the most important)
thing, the thing that society should be most concerned with protecting. This is as
opposed to valuing and protecting the community as a whole, for example, or any other
institutions larger than the individual.
You ask about this
specifically in the context of US History II. Depending on what is covered in your
version of this class, you might be referring to Pres. Hoover's idea of "rugged
individualism." This is the idea that people should take care of themselves rather than
depending on the government to help them. This idea is one aspect or facet of the more
general idea of individualism.
Overall, individualism is a
philosophy that stresses the importance of the individual and his or her interests,
rights, and freedom. It is one of the bases of American society and
values.