The arrival of Governor Don Mariano Tobias, on September 15, 1771, brought agricultural reforms, including making land available to the islanders for cultivation, encouraged the development of cattle raising, imported deer and water buffalo from Manila, donkeys and mules from Acapulco, established cotton mills and salt pans, free public schools, and the first Guam militia.
A chegada do Gobernador Don Mariano Tobias, o 15 de setembro de 1771, trouxo reformas agrícolas, incluíndo poñer terras a disposición dos isleños para cultivar, alentou o desenvolvemento da cría de gando, cervos e búfalos importados de Manila, burros e mulas de Acapulco, construíu muíños de algodón e salinas, escolas públicas gratuítas, e a primeira milicia de Guam.