Mission San Diego was founded on July 16, 1769 by Spanish friar Junipero Serra.

This was the first mission in the chain of 21. It is known as Mother of the Missions.
California Historical Landmark No. 242
Church:135 feet long, 35 feet wide, 29 feet high. Built of adobe. Tile roof.
Mission Grounds: On the 50,000 acres of Mission land were grazing areas for 20,000 sheep, 10,000 cattle, and 1,250 horses. Among crops grown were wheat, barley, corn, beans, and grapes. The mission was known for producing fine wines.

El Camino Real is the kings highway .In Alta California it begins in san Diego and ends 600 miles north at mission San Francisco Solano in Sonoma. They built the missions so that you could walk from one mission to the next in one day.
Four of the missions are still run by Franciscans.
One of the bells is original –it is one of the larger bells.
The local Native Americans were commonly referred to as Kumeyaay. They lived in this area for 12,000 years before the Spanish settlers.

I need help with this. One or more of these words are spelled incorrectly. Identify them and fix their errors.

Kumeyaay. (This is how they spelt it)

Junipero Serra (This is how they also spelt it)
Franciscans (No error)

Therefore, there are no errors in your paragraphs.

I agree.

Not agreeable now! :(

Sure! Let's go through the text and identify and correct any spelling errors:

1. "Junipero Serra" - Correct spelling.
2. "Mission San Diego" - Correct spelling.
3. "California Historical Landmark No. 242" - Correct spelling.
4. "Church" - Correct spelling.
5. "Adobe" - Correct spelling.
6. "Grazing" - Correct spelling.
7. "Cattle" - Correct spelling.
8. "Horses" - Correct spelling.
9. "Wheat" - Correct spelling.
10. "Barley" - Correct spelling.
11. "Corn" - Correct spelling.
12. "Beans" - Correct spelling.
13. "Grapes" - Correct spelling.
14. "El Camino Real" - Correct spelling.
15. "Alta California" - Correct spelling.
16. "San Diego" - Correct spelling.
17. "San Francisco Solano" - Correct spelling.
18. "Sonoma" - Correct spelling.
19. "Mission" - Correct spelling.
20. "Franciscans" - Correct spelling.
21. "Bells" - Correct spelling.
22. "Kumeyaay" - Correct spelling.
23. "Spanish" - Correct spelling.
24. "Settlers" - Correct spelling.

All the words in the text have been reviewed, and no spelling mistakes have been found.