The Treaty of Washington of 1871 settled many differences between: United States and Canada
United States and Great Britain
Canada and Great Britain
France and Great Britain

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United States and Great Britain

Explanation:

The American Revolutionary War was a war of independence of the United States of America that was fought between the 19th of April, 1775 and 3rd of September, 1783. The war started when the delegates from the thirteen (13) American colonies in Congress (First continental congress) revolted against the Great Britain over their lack of representation in the colonies and refusal to give consent to parliament's taxation such as Stamp Act and Townshend Acts. Thus, it was simply a war between the Southern states that seceded to form Confederate States and the Northern states that were still loyal to the Union.

Consequently, the Declaration of Independence was written by President Thomas Jefferson to record the proclamation of the Second Continental Congress which declared American Colonies free from Great Britain.

Basically, the Declaration of Independence is a public Act through which the American Colonies were legally declared free from Great Britain by the Second Continental Congress on the 4th of July, 1776. It was signed by the 56 delegates at the Second Continental Congress.

The Treaty of Washington of 1871 was a treaty signed on the 8th of May, 1871 in Washington DC, so as to amicably settle the dispute between the United States of America and Great Britain.

After the American Civil War, the United States of America demanded compensations from Great Britain for the depredation of its confederate warship called Alabama that was built in England.

Hence, the Treaty of Washington of 1871 settled many differences between the United States of America and Great Britain.