The Mexican American War heightened tensions over slavery in that there were many disagreements over whether the new territories won from Mexico should be free or slave territories. The Wilmot Proviso, created to solve the problem, ended up slitting parties on regional areas.
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rising unemployment rates due to cheaper labour from immigrants
The correct answer to this open question is the following.
Although the question is incomplete because it does not provide a specific reference about the author of the letter or any other reference, we can comment on the following.
A primary source is the piece of information that was written by a character or an individual that lived in the moment of the event, was part of the event, or witnessed the event. This individual could have written a letter, or a document -including a book. Or he/she took a photograph. Or was part of an interview. The secondary source includes information from a third person who was not part of the time or event but has found information through other resources. It is the case of an encyclopedia or researchers/historian books.
Answer:
El 25 de mayo de 1810 es la fecha patria mas importante de la historia de la República Argentina, pues en dicha fecha se conformó el primer gobierno patrio, iniciando la Revolución de Mayo que comenzó el proceso independentista del entonces Virreinato del Río de la Plata, el cual culminó el 9 de julio de 1816 con la independencia de las Provincias Unidas del Río de la Plata, hoy en día Argentina.
En esta fecha, patriotas rioplatenses depusieron al gobierno de la corona española comandado por el Virrey Cisneros, estableciendo una junta de gobierno criolla a cargo de Cornelio Saavedra y dando inicio a la Guerra de Independencia de Argentina.
