How did the californios feel about the american invasion and acquisition of alta california? did the californios feel a particularly strong connection to the mexican state?

The Californians felt much connected with Mexico because the many had been born in California of non-Spanish people, married to Spanish speakers. When marrying, the spouses or wives of Hispanics, became the Catholic faith, and after the independence of Mexico from Spain, very often naturalized as Mexican citizens. After annexation to the United States, the Californians continued to recognize themselves as well, and thousands of people are descendants of Californians having very detailed genealogies of their families prior to annexation. The influence of the Spanish language, the closeness with the Mexican borders and the common Spanish past, makes the Californians feel a union with strong Mexico that is noticeable until our days.

Primary sources are usually  more accurate and are written by someone who experienced it or witnessed it. secondary sources are those who heard of it after the fact that can lose details and or twist the event in a light that benefits them.