19. During the 1960's and 1970's, the primary reason for United States involvement in Southeast Asia was to
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The escalating US involvement in Southeast Asia was driven by the logic of the domino theory, which contended that the falling of one country to communism would result in other surrounding countries succumbing to communism, much as one toppled domino will take down others in a row.

        i'm fairly sure that the correct answers are 2 and 3.

        i used both my knowledge of world history and the process of elimination to obtain these answers. option 1 cannot be a possible selection because the mandate of heaven belongs to ancient chinese philosophical belief. option 4 sounds like it would benefit the region than detriment it. however, both 2 and 3 explain a potential reason for what could have contributed to the fall of the roman empire.

      hope this ! if i were you, i'd get a second opinion, because i haven't taken this course for a year. best of luck!

***websites that me understand the curriculum better last year are and ***

what are the options?