It’s hard to tell without flowers & fruits since leaves of some wild grape (Vitis) and the porcelain-berry (Ampelopsis glandulosa) vine leaves are similar looking. Although I’m leaning toward species of wild grapes, flowers & fruits are needed for a confirmed ID. According to sources, grape’s pith is brown and porcelain-berry is white. Check out the included link below for of both genera. Scrolling down toward the end for all the species, and click on each for more images. Best wishes!

http://www.namethatplant.net/gallery_compare.shtml?compare=leaves%20of%20grape-like%20species