Which policy was a last-ditch effort by the US Congress to preserve the Union and stave off secession

The answer is the Compromise of 1850. This compromise wanted to stop the secession conflicts that were happening in the US. The said law was able to diffuse the on-going conflicts with regards to the lands acquired from the Mexican-American War. It was able to stop some issues of the ongoing crisis but citizens have different opinions with regards of this law

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.