All the options are correct in this regard.
Step-by-step explanation:
'The Pig War' is considered one of the strangest and obscure wars in history. The story of the coming of the war started for the pig started in the year 1846. When a treaty was signed between the United States and Britain this year, the treaty was called the Oregon Treaty.
According to this treaty, there was a dispute between the United States, Britain and North America (which later became Canada) over the Rocky Mountains and the Pacific Coast.