What was one result of nativist fears of new immigrants?

A. A constitutional amendment lowered the number of immigrants allowed.

B. Fake sciences claimed that whites were smarter and more capable than other races.

C. More whites and nonwhites married and had families.

D. Nativists worked to help the immigrants become citizens faster.

How does the battle of midway illustrate the importance of intelligence gathering and espionage in modern warfare?

The rise of advertising in the 1920s. i am good with seeing how advertisements shape the roaring twenties and how it developed a new way of life through modern days. but i am not sure what the details of advertising in the 1920s were. if possible can you send me links (preferrably credential links) to sources that maybe show like the first company to start advertising through the radio, how advertising benefits (statistics graphs), etc.

When top-roping is used, how long should the rope be in order to protect the climber throughout the climb?