The outbreak of the cold war was a war between the United States and Soviet Union. This war began in 1945 because the US was a democratic government and Soviet Union had a communism government. That is the reason that the US got involved to prevent the spread of communism.
War of Terror
Americans spy planes discovered Cuba was holding Nuclear weapons for the Soviet Union. The US got involved to stop the placement of nuclear missiles.
Bay of Pigs
Getting Cuban exiles to help overturn CUBA'S horrible government
Castro's government
The Iranian government was mad that Shan was admitted into the united states for medical treatment. The government sent an angry mob kidnaped the U.S. for over a year. The reason for the US to get involved was for Iranian protesters had seized staff of us embassy in Tehran.
World War II
I have the power over everybody!!!!
On September 11,2001 a group of terrorist's named Al-Qaeda hijacked commercial planes and crashed them the twin towers of the World Trade Center and Pentagon. Bush ordered an invasion in Afghanistan to find the terrorists group.
The US cut of trade and diplomatic relation. President Eisenhower made a plan to train Cuban exiles, to remove Castro's government. The reason for US involvement was for the CIA hoped to overturn Castro in Cuba 
i WANT ALL THE POWER!!!
In September 1939, Hitler (a dictator) attacked a nearby country of Poland. During this time the Japanese attacked Peral Harbor which is the reason for US involvment.
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