Why Was The Spanish Flag Changed?

[@danielloureirotarilonte8216]

There are some mistakes or inacuracies here. The map on the beginning, that should have a date, is around XIII century, is quite wrong. At the time Portugal has arrived at the south of its current territory, Aragon was WAY south on its conquest over arabic lands. The current coat of arms is from around 1980, while the flag has the same colours on the 19th and beginning of 20 centuries, the coat of arms was quite different (I quite like our current more more).