Some type of bindweed, Convolvulus species. Most are considered noxious weeds.

Can you give a location? Looks like a Fallopia species. Climbing Buckwheat

Compare to Fallopia cilinotus, which would put in in the eastern NA range?

A bindweed sensu lato, which includes every vine that climbs and binds another plant or object, which is quite a few.

I’m in zone 6b in southern Ontario, just east of Detroit