Historically speaking, it would be the "Erie" canal that has been the most important to the US, since this canal provided for the relatively fast transport of goods between states.
Answer:
The Persian Wars refers to the conflict between Greece and Persia in the 5th century BCE which involved two invasions by the latter in 490 and 480 BCE. The Greeks were, ultimately, victorious and their civilization preserved.
Explanation:
The first practical steam engine was developed by Thomas Newcomen and patented by him. It was developed around 1712 and described as an atmospheric engine. It was simply referred to as Newcomen engine.
It was considered the first steam engine to harness steam power and use it for mechanical purposes.
The Newcomen engine was so successful that it remained superior to all others for about fifty five years before it could be bettered.
The Newcomen engine was later improved by a man named James Watt who made it work more efficiently.
to me, it makes more sense that it’s the first one i mean they did need help