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1914
The United States was neutral.
Just a few hours after the Japanese attacked the United States, the Germans declared war on the United States.
The result of the Spanish/American War helped the United States become a world power by letting other countries know that the United States was not going to back down. Other countries did not want to start a conflict with the United States after this war.
Prior to the Second World War, the estimated population of the United States was 130,879,718. As of 2014, the population is 316.1 million.
World War I Victory Medal - United States - was created in 1919.
United States Navy operations during World War I happened in 1917.
United States Submarine Operations in World War II was created in 1949.
The United States entered World War 2 after the Japanese attacked Pearl Harbor in December of 1941. Shortly after this, Germany declared war upon the United States. The United States was forced to go to war.
Seeing as Pennsylvania is part of the United States and the United States fought for the Allies in World War I, yes.
United States Submarine Operations in World War II has 577 pages.
world war 2
That would be World War 1.
After World War I, the United States of America emerged as the richest country in the world. The war was fought between 1914 and 1918.
In the aftermath of the First World War, the financial center of the world shifted from England to the United States. World War I was fought from 1914 to 1918.
On April 6, 1917 (during World War I) the United States Congress declared war upon the German Empire. In December of 1941 (during World War II), it was actually Germany and its Axis partners who declared war on the United States. This was after the bombing of Pearl Harbor and the subsequent declaration of war upon Japan by the United States.