A ranch foreman we know got permanent residency through amnesty. That was the only way. He was not a college student, had no rare occupational skill, and did not have relatives here. No immigration is allowed for any other categories.
He proved he had worked here five years and never been arrested. He waited the required five years and passed the citizenship test. Two years later they swore him in. He applied to bring in his wife and minor children. That took three years.
There are 15,820 family visas per country per year—Mexico, Monaco, no difference. Adult children from Mexico wait 20 years; eight years if from China or India. Our ancestors were processed at Ellis Island in three hours, and did not have to have a rare skill or be college students or relatives.