What was the main factor that the meiji restoration prevent the colonization of japan?
a.the restoration restored the tradition of japanese martial arts, which combat western forces.
b.more ports were readily opened to trade with the west, eliminating the need for colonization.
c.the japanese gained us protection after the signing of the treaty of kanagawa.
d.rapid modernization and the formation of a strong military made japan very powerful.
e.the restoration the japanese conquer european colonies, shifting the balance of power.

The answer to this would be D. The restoration induced massive change, especially in the sense that Japan reformed its military into the 20th century Imperial Japanese army, which was responsible for winning the Sino - Japanese war and the Russo - Japanese war. They became a power to be reckoned with, so to speak.

US foreign policy today is hard to describe as its changing with the election of trump but lets say that we were observing the time a bit before this and more in the present-day era.

We used to stay neutral will all countries we could but we began to see that it was not always best to stay neutral (as in the case of WWI and WWII).  The failed attempt after World War I to make a league of nations that operated well just demonstrated the problems we had, and was the reason why WWII happened and adolf hitler was able to come to power.

Today, we use economic and military forces on places that are labeled unstable to try and make these places more stable and set up a democratic government.

This for the most part, has failed miserably such as in Syria and Iraq.

Again, mods, please write me if you have concerns over links but I find students learn best sometimes from visuals.  This video describes the problem that happened in Iraq/Syria that led to the failure of US troops trying to make the government more stable.

https://www.youtube.com/watch?v=AQPlREDW-Ro

This second video goes more in-depth about the Syrian crisis and shows how US foreign policies affected it.

https://www.youtube.com/watch?v=RvOnXh3NN9w&t=12s