Scientific Speculation - What logistics are required to close a city

It is near future, Portland, Oregon, and the residents and neighboring farmers are sick of everyone moving there now that climate change has made it a (even more) fabulous place to live. In an extreme gesture, the entire city decides to build a wall around the city and neighboring farms, and (hand-waving) the governments involved are agreeable to it.

Their intention is to be self-reliant. What would they have to do to get to that point?

Note: this is specifically about logistics; I'm handling the government and people's attitudes. This is for a young adult short-story, so high-level is preferred. Assume no trade is occurring.

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Communities

What logistics are required to close a city - from the inside?

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