The general direction of continental glacial advance in the United States was from north to south.
Step-by-step explanation:
Glacial advance involves glacier moving from one place to another. In glacial advance, the glaciers do not melt but move at a faster pace as compared to the pace at which they melt.
Continental glaciers are very large in size and flow outward from their point of accumulation. The movement of continental glaciers in United States has been from north to south because of presence of many such glaciers in North America.