I'm intrigued by the metrics you're using to conclude that the US has been more generous towards China than it has been towards, say, Israel or even Mexico, as a matter of state policy. Especially considering that US placed China under trade embargo and singlehandedly denied it UN representation for 20+ years.
The actions you are describing as representing a historically unprecedented level of generosity seems essentially to boil done to US agreeing to maintain normal trade relations with China, similar to those it has with nearly every other country. Worth noting that the US extends Most Favored Nation (MFN) status to all its trading partners — it's not some exclusive or rare privilege as its name might suggest but a standard practice in international trade.