Which data should I delete before going through US and Canada immigration at the airport?

Hello. I’ll be visiting my sister in Canada in a few months; and consequently, she will also bring me to the states to celebrate my recent accomplishment of earning a doctorate degree

Given the power immigration authorities have to seize phones and laptops, I fear that any information may be used against us just to satisfy their narratives. Up to what extent can they search our devices? Can they search every message I had in my messenger app? Can they …

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