They were based on the elements
Answer:
the answer is 3rd one An increase in foreign -controlled workforces and an increase in the use of labor
Answer: My step sister Alma came from Mexico so I know this
Explanation:
They often send money back to Mexico to support their families. Such remittances provide assistance to many poor families in Mexico and are an important part of Mexico's economy.
A letter written during the time a historical event occurred is a useful primary source document.
Primary source documents are the most original way to understand Historical events.
If it was the letter written for discussing analysing the same historical event after the occurrence of the event, it would have been considered as a secondary source.