Which of the following was true of the webster-ashburton treaty?
a. it established a definite northeastern boundary with canada.
b. it settled british and american claims to the oregon country.
c. it established the southern boundary of alaska.
d. it established the northern boundary of california

The Webster-Ashburton Treaty established a definite northeastern boundary with Canada. Canada was known as the British North American Colonies at the time. The treaty was signed in 1842 by Daniel Webster who was the Secretary of State of the United States and Lord Ashburton of Great Britain. This treaty also ended what was known as the Aroostook War. There was a border war between the United States and the United Kingdom. The disputed border area was the area between New Brunswick (a British colony) and Maine (United States).