Between 1822 and 1846, Mexican governors carved the Salinas Valley into ranchos held by Californio families and by foreigners who converted, naturalized, and married into them. Then California changed flags, and the Land Act of 1851 forced every grantee to prove title in English, at a cost paid in land. Flood, drought, and sheriff's sales finished the job, and David Jacks assembled the pieces by purchase.
Counts of Mexican grants vary by whether concessions, confirmed grants, or filed claims are counted. Historians also disagree on whether the Land Act betrayed grantees or cleared title, and whether David Jacks was a land shark or a fair dealer.