What is the purpose of
Mexican General Issues a Proclamation at Matamoros

In this elaborately-worded proclamation, General Mejía lambastes the Americans for violating Mexico's territorial integrity with the annexation of Texas, and vows to meet the "odious presence of the conquerors" with military force.  i tried my best :]

Explanation:

nigger, that word was originated for white folks   to keep black people under

and when black people use it, they know that's just how they greet each other

and when white folks use it, they know there's a double meaning under

answer; ha,ha,ha, corn on the cop;