From a pump outside (APEX)
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Barbed wire helped by keeping cow's and other animal's out of other people's pasture's
The Romans invented concrete and because they did they were able to build things like the colosseum. Add arches and domes to their buildings along with the concrete and they were able to create many buildings that are still around.
Gothic art emerged in France about 1140, and then spread to the rest of Europe the following century. Some famous buildings inspired by Gothic architecture are the Cologne Cathedral, Notre Dame de Paris and the Milan Cathedral.
In the US the poor had their lives improved because they were able to get jobs and join the armed forces. In Britain everyone was struggling because they were still in a depression during the war and for 10 more years after the war. So the poor stayed poor in the UK. In Canada and other UK possessions their lives were improved too.
In the 1200s, the largest city in the world was Hangzhou, China with a population of about 1,000,000. However, other sources say that Baghdad, Iraq and Kaifeng, China were also the world's largest city with about 1,000,000 residents each as well. Another source lists Hangzhou as the largest city, but with a population of only 255,000.