Answer:
"E pluribus unum" meansing in English is "From many, one". It is a Latin phrase whose most well-known use is that of the national motto of the United States of America.
The most well-known use of the expression, as mentioned, is that of the United States' national motto: it can in fact be found on the state coat of arms inscribed in a golden ribbon held by the beak of the white-headed eagle in the center of the shield, as well as on other government issues based on the same symbol (for example on coins).
The phrase refers to the integration of the original thirteen colonies into a single united nation and was chosen by the committee that was to decide the national coat of arms in 1776 at the beginning of the war of independence, at the suggestion of Pierre Eugene DuSimitiere.