Irish for the Union

This patriotic envelope shows a three-leaf clover labeled North, Border States, and South, as all part of the in common Union.

The included poem reads:
"Here's to Ireland's SHAMROCK, may its pure unsullied green,
As a bond of love and UNION 'midst the Irish e'er be seen,
And may it help bind the love of the exiled Irish shown,
To the land which gave them liberty, a shelter and a home."

Courtesy Library of Congress