By ____________ , the United States faced a dangerous and challenging situation. Americans continued to try remaining friendly with both sides, but American ships were being targeted and attacked.

German submarine used during World War I.

A contest in which no progress can be made and neither side can win.

Limits to the amount of food stuff and other materials available to a population during sparse periods like a war.

The act of spying.

The act of encouraging resistance to the government.

The belief that government is harmful and unnecessary.

The belief that society should own property for everyone’s benefit.

America remained neutral, but public opinion began to turn against the Central Powers because of—

Germany used Unrestricted Submarine Warfare against commercial ships to stop the British from getting supplies.

From 1915 to early 1917,Germany limited U-boat warfare in response to anger from neutral countries, but by mid-1917, they began attacking neutral ships again.

The ________ was a passenger ship carrying passengers and ammunition to England. It was sunk by a German submarine in 1915.

In January 1917, the British decoded a secret telegram between Germany and ___________.

The Zimmerman Telegram said that Germany would return to unrestricted submarine warfare in February 1917 and seek an alliance with Mexico if the United States entered the war.

The United States entered WWI in ________.

The United States declared war in April 1917 to make the world “safe for ___________."

Which were new weapons of war?

select all that apply

Aircraft was used for reconnaissance, protecting airspace, and bombing.

Poison gas, such as ________ gas, could spread far and affect many people.

Machine guns became a decisive weapon that led to a offensive war.

World War I was characterized by the use of ________ warfare.

Which statement describes trench warfare?

By the end of 1914, the war had reached a stalemate. • There was little movement of lines and attacks were ineffective and resulted in heavy casualties.

What type of weapon broke the stalemate?

Tanks were highly effective during WWI.

Tanks made trench warfare obsolete.

In 1918, about ____ million U.S. troops entered the war.

The war ended on November 11, _____, with an armistice, or truce.

In all, about 10 million soldiers lost their lives, including more than ________ Americans.

The US had only 200,000 soldiers in 1917 when it entered the war.

Americans helped finance the war with ______ bonds. They lent money on the promise of future repayment.

How did the war change America?

Women began to fill jobs left by men who were drafted.

Manufacturing jobs brought African Americans to Northern industrial cities from the South. This movement was called the Great __________.