Question about Dell U2719DC

Hi Melanie, I also have a 2015 MacbookPro 13". The display is connected via the Thunderbolt to Displayport cable. If I remember correctly, the cable was even included. It works wonderfully. It has a great picture.

I haven't tried it, but if you can find an adapter from your Mac video output to USB 3 Type C, it should work. Since the screen has a high resolution, you should make sure that the Mac and the adapter can handle it properly.
As I said, I haven't tried it out, but theoretically my statements are correct.