what two things happened in the prohibition period that had to do with oceans

I don't know. What prompts this question? Do you have assigned reading on this topic? Do you mean directly related to Prohibition, or do you mean ocean shipping, military activity, treaties, or just what about oceans from 1919 to 1933?

its a question from my study guide for the moderns 1914-1939

Do your study materials (textbook or recommended readings) address the topic?

The only thing I can think of is that smugglers sometimes used coastal waters (oceans) to bring in contraband liquor from Canada and Mexico and Cuba.

DO you know who disappeared in the great deppresion

http://www.biography.com/people/amelia-earhart-9283280

That was after Prohibition had been ended.

During the Prohibition period in the United States (1920-1933), which banned the production, sale, and transportation of alcoholic beverages, there were two significant events that took place involving oceans:

1. Rum-running: With the demand for alcohol still high, despite the ban, illegal activities such as rum-running became prevalent. This involved smuggling alcohol from other countries, particularly by sea. Ships and boats were used to transport large quantities of prohibited alcohol into the United States, often coming from Caribbean or Canadian sources. Smugglers would bring the alcohol into American waters under the cover of darkness, using fast vessels to outrun or evade law enforcement authorities. This illegal trade contributed to the rise of organized crime and bootlegging during the Prohibition era.

2. Coast Guard enforcement: The United States Coast Guard played a crucial role in enforcing Prohibition laws, particularly in the maritime domain. They were responsible for patrolling the coastal areas, intercepting and stopping rum-runners, seizing illegal alcohol shipments, and preventing their entry into the country. Coast Guard vessels were frequently involved in high-speed chases and raids on smuggling operations. The Coast Guard also employed aircraft and radio technology to further enhance their ability to combat alcohol smuggling across the ocean.

To learn more about these events and the Prohibition era's impact on oceans, one can explore historical resources, books, documentaries, or online archives dedicated to this significant period in American history.