All those settings are correct, i'm using the querty U.S. keyboard. Meanwhile, I "subscribed" to a free USA holidays app which adds them all, but now how do I get rid of all the Spanish Holidays?

Don't know what app you used, but you can subscribe to the US Holiday Calendar by doing the following:

1. Tap Settings
2. Tap Mail, Contacts, Calendars
3. Scroll down and tap Add Account...
4. Tap Other
5. Tap Add Subscribed Calendar
6. In the server field, input: ical.mac.com/ical/US32Holidays.ics - then tap Next
7. On the next screen, change the name of the calendar under "Description" if you choose - then tap Save

Go to Calendar then tap on Calendars button up left. Can you uncheck or delete it?