Father Serra was the man who came in, in the 1700s, to start establishing those missions all along Alta California.

塞拉神父在18世纪来到阿尔塔加州，并开启了一系列任务。

The vast Spanish colony of Alta California soon became a province of Mexico.

广阔的西班牙殖民地阿尔塔加利福尼亚很快成为墨西哥的一个省。

He also convinced Indians from the area to help him build a fort, which came to be known as Sutter's Fort, and a major destination for American settlers, who started arriving at Alta California.

他还说服该地区的印第安人帮助他建造一座堡垒，后来被称为萨特堡垒，这是开始抵达阿尔塔加利福尼亚州的美国定居者的主要目的地。