OK, so we're dealing with a college student. On that note, let me direct your attention to this page:
https
/laptopunderbudget.com/best-laptops-for-college-students/
You'll find that you can get some great laptops in your stated price range - especially if your son isn't going to play too demanding games. Most of these laptops use their integrated graphics engine (Intel HD 5500 or Intel HD 520) and it will play the kind of games you mentioned.
And under this link:
https
/laptopunderbudget.com/best-laptops-under-700-dollars/
...I'd also like to point to the 14" Lenovo ThinkPad T450 and the 15.6" Acer Aspire, both priced at $700. The ThinkPad is a business machine with decent specifications, although its screen isn't too impressive at 1366 x 768 and the harddrive is a traditional 7200rpm spinner. It does, however, enjoy a reputation for solidity and ruggedness that is likely to last well into your son's post-graduate career. The Acer Aspire is a full-size laptop and with a 2K display, separate 2GB graphics card and a 256GB SSD it is quite a bargain.
Finally, you might also consider this 14" Lenovo Flex:
http/shop.lenovo.com/us/en/laptops/lenovo/flex-series/flex-4-14/?menu-id=lenovo_flex_4_14
Scroll down the page to 'Models' and locate 'Part Number: 80VD0008US'. It's priced at $699.99 and offers a 2K IPS touch-screen, 2GBs of separate graphics and 256GBs on an SSD. It might actually be overkill for your mission, but given its harddrive and CPU this laptop will also see your son through college and beyond.
Best of luck,
GreyCatz.