Number one is correct.
two is letter 'C', because railroad to horse drawn carriage is a step back, then horse drawn carriage is two steps forward. it's not "progression"
Answer:
Explanation: TRUMAN DOCTRINE: The Truman Doctrine was an American foreign policy whose stated purpose was to counter Soviet geopolitical expansion during the Cold War. It was announced to Congress by President Harry S. Truman on March 12, 1947, and further developed on July 4, 1948, when he pledged to contain threats in Greece and Turkey.
MARSHAL PLAN: The Marshall Plan, also known as the European Recovery Program, was a U.S. program providing aid to Western Europe following the devastation of World War II. It was enacted in 1948 and provided more than $15 billion to help finance rebuilding efforts on the continent.
BERLIN AIRLIFT: In response to the Soviet blockade of land routes into West Berlin, the United States begins a massive airlift of food, water, and medicine to the citizens of the besieged city. For nearly a year, supplies from American planes sustained the over 2 million people in West Berlin.
KOREAN WAR: The Korean War (1950-1953) began when the North Korean Communist army crossed the 38th Parallel and invaded non-Communist South Korea. As Kim Il-sung's North Korean army, armed with Soviet tanks, quickly overran South Korea, the United States came to South Korea's aid. ... This Chinese army attacked the US/UN/ROK forces.
Just a tip you can find all your answers online if just type the name and brief description or you can put the name of the event and type cause of this event then just shorten the answers.
a series of complicated factors caused the war, including a brutal assassination that propelled Europe into the greatest conflict the continent had ever known. The murder of Archduke Franz Ferdinand outraged Austria-Hungary. ... Austria-Hungary was furious and, with Germany's support, declared war on Serbia on July 28.
