[noteanddata]

to put some data here: https://www.iie.org/Research-and-Insights/Open-Doors/Data/In... in 2017/2018 year, there are 363K students from China studying in USA.

https://www.uscis.gov/news/news-releases/uscis-reaches-fy-20... 2018 H1b visa total quota is 85K in total for all students from all countries.

while usually <20% of H1B visa goes to people from China. https://www.vox.com/2017/4/13/15281170/china-india-tech-h1b-... so, each year, it's probably around 10K to 15K students from China can get H1B visa, compared to a total of 300K students in China, that basically means about 90% students will have to go back.

it's more about fast growing number of students from China, also working in US requires H1B visa.