Explain the struggles that presidios faced. Why do you think a Spanish soldier would take on such a difficult job

Due to attack of local Americans.

Explanation:

Great struggles faced by presidios because the native Americans attack on the presidios. The Spanish capture these regions of America and build a fortified base named presidios in order to maintain control over the region and save themselves from the attack of the native Americans. The life of soldier is full of difficulties because they risk their lives for the country and its people and tried to expand the boundaries and increases the influence of the country with the help of war.