I don't understand why it matters. Americans go to China all the time. I even went there. And yea, I had a Chinese visa in my passport because I went to China, since we need one when we go there, so it was like, bam in their face, when they opened up my passport, not just a measly stamp. And customs guy immediately saw it, and said, I see you went to China, and then asked if I ate chicken feet there. I told them it got served to us multiple times, but I couldn't try it, it looked too gross. Customs guy laughed and said, "welcome home." And that was literally all they asked me about it.