The cultural change that resulted from an eight hour workday was that leisure times was "invented" people suddenly had more time as they were able to work for only 8 hours, they could spend other time doing other things.
Before the panama canal people from East coast of America who wanted to go to Asia had to either sail around south America which took months or sail towards Asia and go around Africa which took even longer. The panama canal was a short cut right in the middle of central America which cut navigation time in half. Hope I helped. :)
Answer: The Cambrian Period
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Political cartoon, a drawing (often including caricature) made for the purpose of conveying editorial commentary on politics, politicians, and current events. Such cartoons play a role in the political discourse of a society that provides for freedom of speech and of the press.