You must've gotten an American primary education, because that's exactly the underlying point.
America has always been accommodating to immigrants ever since its start, even with Chinese Exclusion and other anti-immigrant legislation.
Since the Chinese began being shipped to America in the 1800s, their population grew significantly. Of course, a lot of these Chinese aren't immigrants but rather "America-born Chinese".
If you start Communist China's history from 1949, you can easily find out they haven't actually been pioneers of immigration and democracy, and it seems that they won't ever be in the future.
You can do the math yourself, how many Americans in China will there be in 500 years time (which is 3 times the years that the Chinese have been in America), given there are currently 72,000 Americans (assume they breed within each other at a 0.75% rate (50% more rate than US population).
The US has very big land mass with little population and therefore, they want immigrants, especially from allegedly highly-productive ethnic groups, preferably Chinese and Vietnamese, who are still poor. (I myself have been asked to prepare documents to immigrate to Canada for several times but refused).
In the meantime, China, with same area as the US, has a population more than 4 times as big. In addition, ethnic Chinese are productive and highly intelligent. They do not need immigrants from any other countries.
Why do they need American immigrants, who have lower average IQ and generally less educated than an average Chinese, but ask for a salary 4 times higher. Except for English teaching, Chinese does not need Western immigrants (and vice versa, Western immigrants do not want to immigrate to China for same reason: They do not want to immigrate to a highly competitive, homogeneous country to receive generally lower salary.).
Currently Japanese, Taiwanese and Korean still want to immigrate to sparsely populated, rich natural resourced, multi-cultural countries like Australia, Canada and New Zealand, but few people actually want to immigrate to homogeneous Japan, Korea or Taiwan (even Vietnamese, who have lived in Korea or Japan for 10 - 15 years and can get citizenship, generally prefer to come back to Vietnam rather than settle).
However, If China opened their border for immigrants, just like the US, within a few years, I believe at least several millions of people from South Asia, South East Asian, Middle East and Eastern European countries would apply for a permanent residency.