Transplanting Oregon Grape
From the picture it would appear your Oregon Grape (sometimes called Holly Grape or Oregon Grape Holly) is suffering from transplant shock. Damage to roots, overwatering, or improper planting can all cause transplant shock. If there are a combination of stresses, the plant may die. Purdue has good information on transplant shock, how to help your plants become established and what to do about dead or dying plants at: https://www.extension.purdue.edu/extmedia/BP/BP-31.html . If the roots are OK, there may be hope of the plant surviving, but it's a wait-and-see situation.