In some parts of the world, the same way as today. They had engineers, experience, schools, training, etc. 2,000 years ago in Rome, for example, was surprisingly similar to modern day. We’ve come a long way with convenience technologies, but not much else has changed that drastically. There are bigger, better-engineered construction projects from 2,000 years ago than many today. We forget that some areas had plumbing, heating, cooling, fast food, etc. thousands of years ago, obviously using different methods, but they existed.
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