A treemap of U.S. trade with Canada visualizes the value of exported goods across 99 product categories. Each rectangle's area encodes the export value in US dollars, while color encodes the product category using a faded categorical palette. The visualization uses D3 v4’s hierarchical treemap layout with the squarified tiling algorithm to recursively subdivide the space. A radio button labeled “Size” is provided, though it only toggles the single available mode; hovering is not implemented, and the animation is limited to the initial layout transition. The data is from the Flare toolkit and Jeff Heer’s dataset, adapted by andrewwitherspoon.