Parashat Vaetchanan, slightly belated: Great explanation of why the Torah proclaims that G!d is One

Read here.

Shema Yisrael: In What Way Is “YHWH One”?

The Shema has many interpretations, philosophical, eschatological, national, etc. A historical-critical way to understand the Shema is to read it (and Deuteronomy more broadly) against the backdrop of Assyrian domination, when Assyria touted their god Ashur as the supreme master of the world.