Rutherford B. Hayes was the 19th presedent
It would be B.) it just makes the most sense.
The 1846 Battle of Santa Fe in the Mexican-American war was significant, because a) Santa Fe was the capital of Mexico, and the US victory forced Mexico to surrender. However, when General Kearny and his troops reached Santa Fe, there were no Mexican troops to battle the city for and not one shot was fired, as the Americans claimed the capital of Mexico and went on westwards to claim land that is still part of the United States today.
Answer:
A A Declining economy
Explanation:
There poor economic policies led to a weakend military which allowed barbarians easy access to the empire.