Historically, it is often used to describe the cultural integration of immigrants to the United States. ... The exact term "melting pot" came into general usage in the United States after it was used as a metaphor describing a fusion of nationalities, cultures and ethnicities in the 1908 play of the same name.
A civic responsibility is the responsibility of someone who is a citizen. Not to be confused with a civic duty which is something that must be done (like serving on jury if you are requested)