Since 1924 when the Border Patrol was established. Before that, they came and went as they saw fit.
Mexicans
When it was America
in 2008 it was 3 million, but I'm not sure about the present date
Because the dust and stuff was from the past year and want a new start
1821
Mexicans
1812
Illegally.
Mexicans simply speak Spanish so it would be - Feliz año nuevo - translating as happy new year
Living conditions in Mexico vary greatly. Millions of people in Mexico live in substandard conditions regarding housing, drinking water, electricity and jobs. Therefore to get a better life millions of Mexicans want to get into the USA, either by legal immigration or by illegally crossing the border. Since many many American companies, individuals and farmers hire Mexicans to do things for less money than Americans would require and be legally entitled to, there are thousands of jobs in America that Mexicans know are there should they get into the USA either legally or illegally. Since their families are often poor and need a better life Mexicans continue and will continue to attempt to get into the USA by whatever means necessary. No matter how high a wall the USA builds along the border, Mexicans will still try and get into the USA for a better life for themselves and their families.
The largest immigrant group in the US are Mexicans, of which about 800,000 Mexicans migrate to the US every year.
March, 1836.