Why did president kennedy got the usa more involved with the conflict with the vietnam between 1961-1963

What triggered the surge of conservative governments in central europe at the end of world war i? a. the disintegration of european families in the wake of urbanization. b. a worldwide revolutionary upsurge. c. the revival of the austrian-hungarian and ottoman empires. d. the british suppression of the indian nationalist movement. e. the killing of the tsar during the russian revolution?

What was the main point of truman doctrine ?

This is the belief that a nation must develop and maintain a strong military force in order to pursue and defend its national interests.