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When bitcoin transactions are made, I know that they are put into the mempool. After certain transactions are added to a block and that block gets verified, what happens to all the other transactions that did not meet that threshold? Do they just get rejected?

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Do they just get rejected?

No, they will just wait for another block to be included in.

Note that transactions have a time to live in the mempool of 336 hours (configurable using the maxmempoolexpiry startup option).

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Addition to darosior's answer:

Remember that there's no single mempool - every node maintains its own. Thus a miner can mine a transaction after a long time if it's still valid (its input not spent by another transaction.)

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