Can you help me identify this tree?

TwoPlusCute
by TwoPlusCute
I have this tree in our yard that recently (May) flowered with beautiful clusters of small white flowers.
Last winters brought it down but maybe I can propagate it and replant elsewhere.
It survives 5B zone's weather (pretty cold, a lot of snow).
Does anyone know which tree species it is?
Close up of a cluster.
Foliage.
Leaves and flowers.
Bark, old and newer.
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