Answer:
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.
Explanation:
I dont know the explanation,but ill give you this for help, The Constitution grants Congress the sole authority to enact legislation and declare war, the right to confirm or reject many Presidential appointments, and substantial investigative powers.
There are a couple of reasons for why the empire didn't last. One of those reasons is that the empire was too great (big). Because the empire was too huge, it was divided into different parts after Alexander's death. He also didn't have an heir to the throne, so when he died, officials fought for power and to become king, which also contributed to the fall of the empire as well.