The United States pursued gradual engagement to the Allied nations of Europe by passing the Lend-Lease Bill.
Under this bill, the United States will provide Great Britain the necessary supplies and armaments that it needs to fight against Germany. Knowing that Great Britain's liquidity is questionable, the United States will not demand immediate payment and when the time comes that payment is demanded,they will accept other modes of payment beside cash.
In this scenario, the United States did not violate the Neutrality Act of 1939. They also ensured that the war fought in Europe will not reach their shores by ensuring that Great Britain has the capacity to fight and win the war against Germany. Thus, their assistance through lend-lease bill.
It would be primarily commerce that takes place "within states" that is not a power of Congress, since the main power of Congress in this regard is to regulate interstate commerce.
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The last British Army in the area was led by General Cornwallis. The army retreated to the town of Yorktown. But then they were attacked. The British tried to escape by sea but the recently allied French had their navy blocking the British ships from escaping. While the French were blocking their escape by sea, the combined army of the Colonist and the French attacked by land. With no hope of escape or reinforcements, the British surrendered. This marked the last battle of the Revolutionary War.
