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In-N-Out, which turns 75 this year, is expanding to its eighth state – Tennessee. But the first restaurant won't open in Nashville until 2026. Here's why it takes so long for In-N-Out to open restaurants in new states.In-N-Out announced plans Tuesday to open its famed burger restaurants in Tennessee – marking two significant milestones for the iconic California chain. Tennessee will be In-N-Out's 8th state...