Answer:
Migrant workers arrived to work on farms and railroads.
Step-by-step explanation:
The migration of Mexicans into the United States has led to the huge population of Mexicans and Cubans, among others, in the various states of America. They have also inhabited and constitute almost half of the population in many of the bordering states of the United States.
One of the main reasons for the increased immigration of these people from Mexico to the United States is that they came to work on farms and railroads. This increase between 1900 to 1950 was the result of the local workers refusing to continue working while these immigrant workers can be 'employed' with lesser wages.
Thus, the correct answer is the second option.