What did the 1871 Treaty of Washington address?

• A. All of the above
• B. Trade issues between the US and Britain
• C. American ships illegally fishing in Canada's waters
• D. Disagreements over navigation rights on the St. Lawrence River

Answer: (D)

This question is about what the 1871 Treaty of Washington was mainly aiming to resolve. The treaty’s primary impact was in settling disputes between the United States and Britain after the Civil War and establishing a process for resolving claims, notably the Alabama claims. Alongside that settlement, it included terms that addressed how shared waterways would be used, especially navigation on the St. Lawrence River, which was a critical route for cross-border trade and thus a major point of contention between the two nations.

So, the best choice is that the treaty dealt with disagreements over navigation rights on the St. Lawrence River because that provision directly relates to how American and British (through Canada) ships would access and use that important waterway, helping to reduce friction and promote orderly transit. The other options describe issues that were not the treaty’s main focus—general trade issues or fishing rights in Canadian waters—topics that were handled in other agreements or at other times.