Why did a U. S. military presence remain In Japan after after the formal occupation ended?

After the formal occupation ended, Japanese government agreed to form an alliance with United States government.

This led to the creation of  The Treaty of Mutual Cooperation and Security between the United States and Japan in 1960. In this treaty, Japanese government agreed to let United States built a military base in its territory in order to gain easier Access in Asia Pacific region.  As per today, we have around 31,000 military personals in Japan.

switch around #3 and #4

explanation:

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the correct answer is "c: merchants" and "e. soldiers".

the song dynasty was known as the first government in the world to introduce paper currency. it was also the first chinese government which established a permanent standing navy. finally, the first compass was introduced during this period of government.

all of these innovations heavily affected commerce in a positive way. printed money dynamize commerce within the borders of the empire due to an easier way to quantify value during the trade. the introduction of the compass trade routes to be faster. finally, the introduction of a standing navy regulate trade routes.

regarding military affairs, gunpowder was created during this period. this was a tremendous improvement that was widely utilized by the military in order to innovate in the manufacturing of weapons.