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.
The property damage amounted to the destruction of 92,000 pounds or 340 chests of tea, reported by the British East India Company worth £9,659 worth, or $1,700,000 dollars in today's money.
Answer:
Nixon administration dropped 100's of bombs on north Vietnamese for 11 days straight, then negotiations resumed, both agreed to end war and bring peace in Vietnam.