The correct order to form a coherent paragraph is 2 → 1 → 4 → 3. Here's the logical sequence:
This sentence introduces Canada's ownership and sovereignty over the Northwest Passage, setting the context for the dispute.
This sentence presents the US perspective, which challenges Canada's sovereignty over the passage by considering it an international waterway.
This sentence discusses the unresolved legal issue but notes that there is a bilateral agreement on access, with Canada’s consent required for US transit.
This sentence concludes by suggesting that future changes in Arctic ice conditions might render the current dispute irrelevant.
The correct sequence is 2 → 1 → 4 → 3. This sequence logically builds the context of the dispute and concludes with a future outlook on the issue.
When $10^{100}$ is divided by 7, the remainder is ?