The correct answer is - B. They had pledged to fight with other countries.
After the assassination of archduke Ferdinand in 1914 lots of countries quickly joined World War I because they had already pledged to fight with other countries. The terrain for war was pretty much set, and alliances were already made, the interests were known and on the table for few years before that, so the assassination of archduke Ferdinand was just the point that marked the starting point of the almost inevitable war.
As a way to measure distance between two points in the earth and for ease of travel
The correct answer for number 2 is Congress stressed isolationism and passed five neutrality laws.
The US Congress did not want to get involved in another expensive overseas war that did not directly affect US citizens. This is why Congress passed laws forbiding the US from trading with countries at war or entering areas that would be considered hostile.
The correct answer for number 10 is The US wanted to end the war with fewer US and Japanese casualties.
Truman argued that a Normandy type invasion on Japan would cost many more American and Japanese lives in comparison to dropping the atomic bombs. He felt that this move would shorten the war and save more unecessary casualties.
The correct answer is
A.<span>
Charlemagne briefly reunited much of Western Europe by ceasing war with
his enemies after calling upon the Pope's support.
He was known by the Pope as the Emperor of Romans which brought Christians back
and helped reunites the Western Europe. </span>
