US projection conventions

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Happy New Year all,
I have a question relating to best practice when it comes to picking a map projection in the US, I'm based in the UK.
Up to now, the distribution of my source data means I've been picking the relevant State Plane or UTM, but what do you do when the data is spread out further, say over three-four states E-W/N-S (~15 degrees), goto continental systems? just wondering if there was any standard conventions around this?
Thanks,
Dave


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