An obvious defect in the united states' banking system that was exposed during the great depression was

Lack of Regulation

Explanation:

The great depression showed the world that the US financial system was largely unregulated, which made it have a trust problem. As a result of the depression, new efforts like the SEC were put in place to regulate the markets.

the soviet union wanted to impose communist governments in eastern europe.

demand is the need and oportunity to buy a given good or service.