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On the other, western, side of the continent, the Peace Arch Park, which straddles Washington State and British Columbia, was once a similar symbol of close relations. Since 2024 Canadians must check in with America’s border patrol to access the Washington side of the park. 

“We have proven that you can secure a border by working together,” says Laurie Trautman of the Border Policy Research Institute at Western Washington University. “But once you put these borders up, they’re really hard to tear down.”