Why did stock prices fall so sharply on Black Tuesday?

If one thinks illegal immigrants should become american citizens, should they become american citizens automatically or should there be a waiting period? if there should be a waiting period, explain why.

In 1819, what did the united states obtain from spain for $5 million?

What can you conclude was a benefit of living a more settled life for prehistoric man? a. more food choices b. more freedom c. less work d. simpler lifestyle !