I think the Spanish just don't very good representation in television or film as far as the colonial era goes. By the 19th century we equate Spain with mexico in most media so there's a lot of animosity there, plus they're the most associated with native American deaths and slavery, and rightfully so. It feels a bit like celebrating imperial Germany pre-wwi even if you know that empire had nothing to do with the Chaplin impersonator.
I would be interested in more Spanish rifles as I know nothing about them. And that musket is great looking.
The AWI was a civil war. Englishmen fighting Englishmen. The Bourbon kings were happy to help one side against the other. Neither France or Spain was advocating the dissolution of monarquies. It was more of the enemy of my enemy is my fried.
By the same token the English colonists would take help wherever they could get it. A marriage of convenience if you will.
As Dale points out, without the fall of Pensacola, at the hands of the Spanish Governor of Louisiana, Bernardo de Galvez, Yorktown would have not happened.
Once the war was over we almost went to war against France. The Spanish became the dreaded Papists. Never mind that the English were Papists before Henry VIII was King. The animosity towards Spain has its roots to that period.
As far as Native American deaths and slavery goes, you have got to be kidding me.