Maryland does have species of native Emerald moths as well, though they can look so much alike that they're hard to tell apart. This might be a Red-Bordered Emerald or Red-Fringed Emerald; our best guess based on the details visible in the photo is the Red-Bordered. Similar-looking relatives Nemoria saturiba and Nemoria tuscarora, neither of which has a common name, also occur in Maryland. Wavy-lined Emerald Moth and Southern Emerald Moth are similar in size and patterning, though are missing the reddish wing border that your specimen has.

Miri