Today China is emerging as an economic, political and strategic power. What role has the United States of America played in this? I look forward to the fair opinion of all of you.
A great avenue for research. I strongly recommend you Mearsheimer's piece on the issue: https://www.foreignaffairs.com/articles/china/2021-10-19/inevitable-rivalry-cold-war
A short answer cannot be given. The US played a crucial role in China's development as it exported technology and knowledge to the country. Moreover, the US is a large importer of products made in China. A cooling of relations between the two economic giants would be difficult for the US to bear and could have fatal consequences for China. A rich literature has been published on this topic.