Why doesn't the United States restrict Hispanics from moving into the United States?

America is a country of immigrants. Due to historical reasons and the development of its own population, the United States must allow immigrants in order to reach a certain population. As for your worry that immigration will affect the country's instability, I think you are alarmist, because the United States not only has a strong culture and system, but more importantly, the United States has perfect national systems and policies, and every citizen who becomes an American can find a sense of belonging in this country. As for the racial discrimination you mentioned, it is not unique to the United States, but a common problem all over the world, and the United States has handled it very well. Think of the frequent cross-racial attacks and casualties in India, but not in the United States. In addition, the United States is a multi-party ruling party with good ruling ideas and abilities. Every citizen has the ability to influence who is elected as the head of state. Therefore, there may be such a problem in the United States, but it is only the problem of the rulers. The rulers do not represent the country, but only the political parties. If there is something wrong with a political party in power, citizens can give up the party in the next election, which is the most important reason why there has been no domestic unrest in the United States for hundreds of years, because if you have any opinions about the country's ruling ability, you can express your opinions reasonably or attack the rulers legally. This is legal and the right of every citizen, so you don't need unrest, because if you have the ability, you can organize a political party to run for election, and if you have strong ability, you can also become president and carry out your ruling philosophy instead of taking the most risky riots. People will riot because their demands cannot be respected and treated fairly through normal channels, so they can only take risks. In fact, this truth is true in any country. The United States happens to handle this issue best. If a country wants to be strong, it is impossible to rely on one person or a part of people. It is up to the people of the whole country to unite and do their best for this country, find a sense of belonging in this country and feel that they are the real masters of this country. Only in this way can the country be strong, otherwise, it will only lead to turmoil in the end.