Answer:
aggressive acts from Germany during WWI, especially the sinking of passenger ships and the Zimmerman telegram, caused the United States to align with Britain during the war.
Systems of checks and balances?
Economics
The treasure fleet voyages cost Ming China vast amounts of
money and brought nil returns since they were not trade excursions but only
brought back exotic novelties. As a result, the government recovered little of
the cost. Moreover, China was self-sufficient and did not need anything from
the Indian Ocean countries
