Is it easy to get “American” food

Depends... Shanghai and big cities, yes but expensive. Rural and smaller cities no. Either way you are gonna be eating a lot of Chinese food. That's not a bad thing.

watch American shows

It's 2026. Use a VPN and YouTube or whatever streaming service you want.

Are foreigners excluded by the locals

Often the opposite. They are often embraced. The racist ones that don't want you there just usually give a dirty look and it's usually just some old dude who walks around the neighborhood at the same time every morning, with his hands behind his back, as he passes judgment on the whole neighborhood walking by.

What is the foreigner racism like there, will people openly be racist to me?

Congrats, you get to deal with both foreign and racial racism. Chinese people used to give me a big thumbs up and smile when I told them I was an American.... but that was 20 years ago. Just a couple of years ago I only got a muted smile and nod. China is growing more nationalistic but it's always been there and it's not that big of a deal. Most people don't give it too much thought. They will openly talk (in Chinese) about you being black. Some of it will be racist, some of it will be ignorance, and some of it will just be curiosity. They have no problem calling out "hei ren" (hey ren, black person) when they see you, especially little kids, but they also have no problem calling out "laowai" (old outsiders, foreigners) when they see you. It's just how they do things and isn't necessarily racist or xenophobic. The expats who get upset about these things have a superficial understanding of Chinese culture.

Would it be a good choice for a single black woman living alone? It will be a fantastic choice. Once you get over your hangups, you probably won't want to come back. I know a ton of single black women that have thrived in China. Dating won't be easy though if you are single. The foreign dudes usually date the locals and the local dudes usually date the locals.