Sources of power before steam were:
1) People; human muscle power did most of the world's work for most of history.
2) Animals: horses, or more usually oxen, mules, donkeys. Even a donkey can power a mill if you harness it to a pole attached to a vertical rotating shaft and drive the donkey round and round in a circle all dy.
3) The wind - windmills are now coming back in a big way! and don't forget sailing ships. sailing ships were still used for trade up to the first half of the 20th century.
4) The strongest sort of power - water. Remember that a watermill did not necessarily just grind corn; water power can drive any sort of machinery, and indeed began the Industrial Revolution, which steam merely amplified.
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The horse was used for many, many centuries before the advent of steam power which in turn was relaced by the internal combustion engine.
The spinning jenny was used to hand spun cotton in mills. It was replaced by the rotary steam engine.
The impact of the steam engine on the production of British goods was the increase in supply and demand. Britain was able to transport goods more efficiently.
The steam generator was one of the most important invention in history. This invention turns high steam or water vapor into energy by using a generator.
Spain used the Peseta before they changed to the Euro.