I was addressing the assertion that this is the first time China attacked the U.S. Whether or not the U.S. reciprocates is off-topic, but to answer your questio

I was addressing the assertion that this is the first time China attacked the U.S. Whether or not the U.S. reciprocates is off-topic, but to answer your question: I don't know about any evidence that would suggest the U.S. reciprocates.