This might be Kentucky Coffeetree (Gymnocladus dioicus), a species native to the U.S. but rare in Maryland since we're on the very edge of its native range. The foliage of native Devil's Walkingstick (Aralia spinosa) looks superficially similar, though there will be prominent spines on the main stem / trunk; the leaves pictured don't look toothed enough to be this species, but we mention it as a comparison. You can use tools like the Virginia Tech dendrology key to use foliage, stem, and bud characteristics to narrow-down which species this might be. (Coffeetree is included in its database.)

Miri