Question

what was the act of union?

Answer 1

The American Art-Union (1839–1851) was a subscription-based organization whose goal was to enlighten and educate an American public to a national art, while providing a support system for the viewing and sales of art“executed by artists in the United States or by American artists abroad.
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Answer 2

the two roles performed by the union are as follows:

the union at Scotland act 1706 passed by parliament of England and England act passes in 1707 by Scotland parliament.