Answer: Longitudinal study.
A longitudinal study is one that involves repeated observations of the same variables over a period of time (in the example, it was four years). The opposite type of study is a cross-sectional study (one that looks at the variables at a given moment).
Answer:
He set precedents for the social life of the president.
Answer:
The Treaty of Kanagawa was similar to the treaties China signed with various European powers, in the sense that it allowed Japan to trade with United States and the west, just like the Open Door Policy created a way for trading to take place between China and many European powers—along with the United States, and Japan as well.
The North Korean Communist army crossed the 38th Parallel and invaded South Korea. This in turn led to the Korean war. Hope this helps!
Trade justice is trade, just with rules and regulations to promote "fairness". So pretty much, your trades are watched. Free trade is without the rules and regulations, meaning you are not being watched. But with trade justice, you are being watched to make sure your trades and the persons trades are fair and equal.
I really don't have anything else to add.. sorry, but I hope you get the idea..
