Megastorm Sandy's march of destruction claimed at least 43 lives in the U.S. and left more than eight million people without electricity by late Tuesday, in one of the largest storms ever to strike the East Coast.

Diminished but still dangerous, the storm churned across Pennsylvania on Tuesday in an arc toward Canada, and the northeastern U.S. began its slow process of recovery. In New York, financial markets were expected to resume trading Wednesday, though big chunks of the city are without electricity and its vast network...