Based on the illustration showing freed people with Union Army soldiers what assumption is the artist making about the effects of the emancipation proclamation?

The artist is assuming that the Emancipation Proclamation has been successful in freeing the people shown in the illustration and that they are now able to live freely with the support and protection of the Union Army soldiers. The artist is likely also assuming that the Emancipation Proclamation has had a positive impact on the lives of these freed individuals.