Unrestricted submarine warfare, which became prominent in World War I, meant that submarines could sink any time of vessel at any time without warning. Before this, they had to surface first and place crews on lifeboats.
Providing Guides and limits to the government's power.
Re-read the question. Hope I helped :)
Answer:
Life at this time was by no means easy, or even sometimes pleasant, but people knew – or thought they knew – how the world worked and how to live in it; the plague would change all that and usher in a new understanding which found expression in movements such as the Protestant Reformation and the Renaissance.
Answer:
3/4 of the states must ratify the amendment (37.5 states which rounds up to 38 states needed)