Looking For Suggestions Of A Hedge Or Shrub For Border.

Question

The location of the border would be on a decline if that matters

Answer 1

These articles will give you some ideas:

https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-5/zone-5-privacy-hedges.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-5/zone-5-evergreen-trees.htm
https://www.gardeningknowhow.com/garden-how-to/gardening-by-zone/zone-5/holly-shrubs-for-zone-5.htm