The spanish sought setttlement in north america mainly to

The Spanish settled in North America (Native America) in the 20th century because they found an abundance of gold and silver.

Explanation:  

The Spanish settling in North America (Native America) was as a result of the natural resources they sought to extract from the Native Americans. This Spanish colonization movement started in 1492 with the arrival of Cristóbal Colón as  known as Christopher Columbus.

The Spanish settlers extracted gold and silver from Native America to grow their economy to become the most powerful empire.

The Spanish settlers, in order to achieve their goals, began to enslave the Native Americans and turned them into laborers. In an attempt to also dominate, they sought to convert the Native Americans into Christianity (Catholics) by marrying them.