Do you honestly think China, Russia, Germany, UK....any country, that their governments are sitting around going "how can we run our country for the benefit of other countries before our own citizens"? No, every country looks after the interests of their own citizens first, as it should be. We pay the taxes that run thus country, we live under the rules this country makes, so yes, out country should, in turn, be trying to put us first....in our own country, before the needs of others. That doesn't mean we don't help when needed, but, we certainly don't look to benefit other countries before our own.
That's all that America first means.