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.
Answer:
Lincoln's address starts with “Four score and seven years ago.” A score is equal to 20 years, so he was referencing 87 years ago — 1776, when the Declaration of Independence was signed. The speech was made, then, seven score and seven years ago.
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The Sugar Act reduced the rate of tax on molasses from six pence to three pence per gallon, while Grenville took measures that the duty be strictly enforced. The act also listed more foreign goods to be taxed including sugar, certain wines, coffee, pimiento, cambric and printed calico, and further, regulated the export of lumber and iron.
