Which was a final action leading to u. s participation in world war 1?

a. the addition of mexico to the allies
b. unrestricted german attacks on submarines
c. the bombing of hawaii
d. requests for support from england and france

The option (B) is correct. The unrestricted German attacks on submarines were the final action leading to U.S participation in world war 1.

Further Explanation:

German’s submarine campaign during World War I:

In World War I, Germany was engaged in the unrestricted submarine warfare. It is a situation where submarines attack cargo and passengers ships. In 1915, Germany started the world war by attacking RMS Lusitania. It was an ocean liner. It resulted in the death of 1,190 people, including 128 U.S citizens. The USA declared the war against Germany after this incident.

Before this incident, the USA was neutral in war. After the German's submarine campaign, they joined the allies forced (Britain, France, and Germany). These forces were against Germany.

Thus, the submarine attack from Germany forced the USA to participate in world war I.

Learn more:

1.Learn more about the death in the world war I

2.Learn more about the countries involved in the world war I

3.Learn more about world war II

Answer details:  

Grade: Middle School

Subject: History

Chapter: World War I

Keywords: final, action, leading, U.S participation, world war 1, addition, Mexico, Allies, unrestricted, German attacks, submarines, bombing of Hawaii, requests, support, from England, France.

no because we were not ready for war

it affected it because the kingdoms (with trade) slowly got richer and richer.