Why didn’t China grant trading rights to the British?

The British wouldn't kowtow

Explanation:

Great Britain wanted to open trade with China as it was the main mission of exploration. They had hoped to gain access to the goods China provided. As with all of China's trade partners, they expected a sign of respect shown to the emperor before trade could begin. The British traveling group were asked to bow in front of the emperor to seal the deal. The envoy refused as they could only bow to their own king, which got them thrown out for the time being.

this act gave the federal government the power to relocate any native in the east to territory west of the mississippi river.