What happened to China people who illegally immigrated to the United States compared with the past?

Don't give examples or special cases, it is the general situation. The former refers to the 1990s or before, until the beginning of 2000.

1 methods: In the past, many ships, containers, carriages and even desert snow-capped mountains were blocked. Now almost all of them come to America by plane.

2 Quality of life: In short, the older generation is hardworking and relatively unwilling to spend money. Young people spend money more smartly.

3 Identity mode: In the past, a child was very easy to handle. Now that the Eight Immortals have crossed the sea, I will not talk about it. Say specifically 100% shielding.

Education level and age group: in the past, it was generally primary school level or illiteracy, but now it is generally high school level. Middle-aged people used to account for a considerable proportion, but now they are rare.