The answer(s) are A. South Korea invaded North Korea in the early 1950,s sparking the Korean war.
His decision to bypass war and seek peace with France costed his popularity.
The reason that transformed U.S Politics in the 1920s is the ascent of progressive politicians. The correct answer is option B. This period was known as the Progressive Era. This transformed the U.S Politics because its aim was to eliminate the corruption in the government.
In the early 20th century and late 1900s; A complicated piece of legislation, it essentially gave preference to immigrants from Central, Northern and Western Europe, severely limiting the numbers from Russia and Southern Europe, and declared all potential immigrants from Asia unworthy of entry into the United States.
I hope this helped ://
Special words or expressions that are used by a particular profession and are difficult for others to understand are called "jargon," since they are often only understood by people "in the know".