In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

A federation is a union of a number of self-governing states or regions , which are joined together under a central government .
A federation ( also known as a federal state ) is a political entity characterized by a union of partially self-governing provinces , states , or other regions under a central federal government ( federalism ) .

In 1978 , Marion County-bred and -raised Affirmed won the Triple Crown .
Local horses have won individual races of the Triple Crown series ; in 1978 Affirmed , bred and trained in Marion County , won all three races , boosting interest in the industry here .

Valle d 'Aosta is a mountainous region in northwestern Italy .

The Aosta Valley ( -RSB- ( official ) or ( usual ) ; -RSB- ( official ) or ( usual ) ; ( usual ) ; or ; ) is a mountainous autonomous region in northwestern Italy .