Why was aligning with the south Vietnam government difficult for many to accept

Because of the colonization and vietnam's power structure

Explanation:

Conflict between south and north Vietnam occurred as a result of ideological battle between democracy and Communism. At that time, the soviet union managed to spread the influence of communism on North Vietnam. United States hoped that it can formed an alliance with the South in order to prevent further spread of Communism in South East Asia.

But, western countries have the history of exploiting Vietnamese people for labors during the colonization Era. This made the rulers in south Vietnam thought that the effort to make an alliance was only a ploy for United States to obtain control over the country. This made  aligning with the south Vietnam government difficult for many to accept.

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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