Question: Using smart contracts to verify previous transactions

Is there a reasonable way (as in, not parsing the entire blockchain) for a smart contract to see whether a particular transaction took place? This is assuming that you wouldn't know in which block a transaction occurred.

For example, did account_x transfer ETH to account_y?

And to take it further, could a similar function look at smart contract interactions?

For example, did account_x call smart_contract_hello? If so, what parameters did they provide?
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