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The Buddha's teaching continues to bless us so I suppose the Buddha is still blessing those that discovered his teaching.
The Buddha isn't magic. The Buddha's teaching blesses the one who practices the teaching. The teaching (AKA The Dhamma) isn't magic as well, it's practical and it's sober although magic can happen. Check this out:
Here from the Mangala Sutta are the concise answers given by The Buddha to the question,"What is a blessing"?
The Buddha probably does bless even people that have never heard of the Buddha. The good karmic actions of Dhamma practice should have a ripple effect on many people. :) metta