Walt Rostow, economic advisor to U. S. President Kennedy, suggested that all countries go through four stages of economic development. The first stage is the stage, in which very little social change takes place, and people do not think much about changing their current circumstances.

Explanation:

W.W Rostow was one of the important thinkers of Development studies in 20th century . He was an american government official and economist.  He told about the four stages of Economic growth in 1960s, according to him all the countries passed thorough these stages to become developed. the stages are 1)Traditional society  2) preconditions to take -off 3) take-off 4) drive to maturity and 5) age of high mass consumption.  

Traditional society is a agriculture based economy in which intensive labour is rampant with low levels of trade,  The population also doesn't have a  scientific perspective on technology and the world.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.

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