This is not poison ivy. It is a raspberry vine.
Here we have the classic three leaf configuration, but notice that the end leaf is substantially larger than the two other leaves. Also see the finely toothed edges to the leaves in addition to the slight lobes.
The most telling sign that this is not poison ivy, however, is the presence of thorns along the stem. Poison ivy could have roots along a vine growing on a tree, but these roots will grow into the tree, and look like hair that has been parted with a comb on the side away from the tree.
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