Similarities in Central America

The flags of the majority of Central American nations can be traced to this, the Argentinian flag:

The powder blue was adopted, and modified a little, but the design ethos was shared by the region as a whole, and the flag of Honduras, seen here, retains as close to the original as still exists. The horizontal blue-whit-blue triband is still there, and the five stars represent the five original Central American countries: Guatemala, Honduras, El Salvador, Costa Rica, and Nicaragua. Here's Honduras:

Next we have Guatemala. Guatemala as a name and an idea predates all of the other Central American countries, as the Spanish name for their holdings south of Mexico and north of South America was called the Guatemalan Captaincy (in English). In any case, to stand out, they put their triband vertically, and added their nation's seal to the center:

The next two are very similar, only separated by their coats of arms. The first is El Salvador:

And here's Nicaragua:

I've shown the flag for Costa Rica already, and have a plan coming up for Panama's. Panama was a part of Simon Bolivar's Colombian empire, and was later in fighting for and gaining independence. Belize has been left out as well, and maybe that'll be reason enough later to show it. Time will tell.