You need to find which one trade policy relate each of following questions, And 4-5 data or date source to support each of them.   Reference needed

1,  The trade liberalization between China and the US has positive impacts on US middle class consumers.  Because product imported from China is Cheaper than local

2,  The trade liberalization between China and the US has positive impacts on China middle class consumers.  Because the middle class in China they do have more products to choice.