Horrid teacher!
How could she possibly give this anything less than an A, let alone F? Everyone knows that the picture shows a great battle in which Columbus fights for HIS land. See, we were in America first, then the Indians came from Asia circa 503 B.C., then to avoid genocide, escaped to Mexico. We knew we had a better naval fleet than air or ground attack, so here we are showing the barbarians who's boss! ;D