“Lots of Mexicans, and especially Mexican citizens of the US, have no idea what Cinco De Mayo is all about.”
Five with mayonnaise?
Five OF Mayonnaise. Five WITH mayonnaise is Cinco Con Mayo.
Five with mayonnaise?
It celebrates the day the Mexican Army defeated French forces acting on the wrong side of the pond.
What business did the Frogs have meddling in the Americas, our sphere of influence?
Fortunately, the Mexicans did what the Americans at the time were too distracted to do (something about a Fort named Sumter).