Ask this question again, you're going to need a more specific time the president has done this. however, if you are asking about WWI, the USS Lusitania, the Zimmerman Telegram, German U Boats targeting American ships, and so on.
Answer:
California's size and distance from Mexico
The correct answer is: because he can react to emergencies more quickly than Congress.
The president can appropriate government money in times of a disaster, to react to emergencies quicker than the Congress.
This situation only happens in times of emergency, in which the President is allowed to override the Congress and deliver executive orders without the Congress permission.
These emergencies are declared when: there is an armed conflict, a natural disaster, civil unrest, etc.
<span>The Byzantine Empire under Justinian wanted to promote continuity with the Western Roman Empire.
http://blahschoolstuff.blogspot.com/2017/05/100-module-pretest-world-history.html
</span>
The amendment process is to clarify or alter the United States Constitution. It requires a two-thirds vote in both the Senate and the House of Representatives or a two-thirds vote in a convention by the states. Either of which is hard to have done. It is done this way to Make sure that any amendments done to the constitution have an overwhelming majority of people in support of it.
Some examples whereas the United States Constitution clarifies "We the People" are in amendments 13, 15, and 19. These do not change the effect of the Constitution, it only makes clear that it applies to everyone, regardless of gender or race.
Some examples whereas the United States Constitution is altered is in many other amendments such as term limits like in the 20th amendment.